1st Dec 2006 07:01
Sierra Leone Diamond Company Ld01 December 2006 Immediate Release 1 December 2006 Sierra Leone Diamond Company Limited ("SLDC" or the "Company") Operational Update Sierra Leone Diamond Company Limited (AIM: SLD), the diamond company withlicence interests wholly focused in the country of Sierra Leone, today announcesthe following operational update. INTRODUCTION Over the last 12 months, the Company has been active on a number of fronts andhas updated the market through several regulatory announcements regarding itsalluvial diamond operations, its hard rock exploration programme and its ironore and gold projects. The Company would like to expand upon, clarify,consolidate and update such announcements now that mining of its alluvialoperations has recommenced following the end of the wet season. In somerespects, this update amends previous operational statements that have been madeby the Company. The last 18 months have seen a number of important milestones for SLDC:continued growth of licence areas; the purchase and upgrade of productionfacilities, completion of commissioning and the commencement of alluvial miningoperations at the Konama Mine near the town of Tefiya in the Kono District,Sierra Leone; the discovery of a potential kimberlite province at Kamakwie;delineation of prospective alluvial gravel volumes; the purchase of newearthmoving equipment; maiden revenue from alluvial diamond sales; and thecommencement of a major exploration programme of the Company's iron ore assets. Sierra Leone has historically been the source of almost 50Mcts, representingmore than two per cent. of global diamond production. This peaked between1961-1975 at more than five per cent of the world output but representing anestimated 25 per cent. of world value in that period. Current production levelsin Sierra Leone have dwindled, but as described in the Company's AdmissionDocument, WWW International reported in February 2005 diamond revenues averagingUS$250/ct, which placed Sierra Leone's diamonds as the second highest diamondsin the world, after Namibia's marine diamonds (Source: WWW International,"Diamond Industry Trends", 3 February 2005). The Directors believe that thesource of those diamonds remains within Sierra Leone, and that in addition tothe known alluvial diamond potential, there is the potential to discover a hardrock source, or sources of this past production. SLDC's hard rock explorationprogramme is targeted at discovering such potential sources and is the long termfocus of the Company. However, in the short to medium term, SLDC intends to develop cashflow fromexploiting the alluvial gravel deposits in the south west and central parts ofthe country, as previously described by PK Hall in his definitive report "TheDiamond Fields of Sierra Leone" (Sierra Leone Geological Survey, Bulletin No. 5,1968) (the "Hall Report"). This report followed an extensive seven year fieldprogramme and incorporated 25 other geological reports and publications garneredover a 47 year period up to 1966, and also drew from reports of the Sierra LeoneGeological Survey and the British "Sierra Leone Selection Trust" - the principaldiamond producer in the country during this period. While this report is nowrelatively old, it is not considered by the Directors to be dated. Hallidentifies several areas of gravels along the various river systems, but thesedo not conform to modern resource and reserve standards, such as JORC, SAMREC orCIM. ALLUVIAL OPERATIONS As set out in the Chairman's Statement to the 2005 Annual Report published inJune 2006, SLDC has reviewed the relevant Hall Report references to potentialdiamond deposits in the Middle Bafi area which previously suggested a grade of50cpht. The Company has since carried out limited bulk sampling in the area andafter reviewing production records from the previous mining company's activitiesin the area, reassessed the potential recoverable grade to a background grade of25cpht. These figures still need to be proved and do not represent actualresults to date. However, the Directors believe that the actual recovered gradeduring steady state operations will be a considerable improvement on currentresults. In assessing the potential size of the alluvial deposits within SLDC's licenceareas, the Company based its estimates of these potential deposits on the datagenerated by the Hall Report and combined it with the data generated by its ownbulk sampling drilling, pitting, mining activities and SLDC's High ResolutionAero-Magnetic ("HRAM") data interpretations, resulting in an internallyestimated 100 million tons of gravels. SLDC is in the process of delineatingthese gravels while at the same time developing throughput capability foralluvial production. However, given the early stage of operations, it is notpossible at this time, to classify a formal resource or reserve as per theguidelines laid out under JORC, SAMREC or CIM on any of the Company's diamondlicences. However, it is the Company's intention to move its resources towardssuch standards, once sufficient material has been mined. However, the timing ofthis is currently unclear. Sewa/Bafi River During the second quarter of 2005, the Company initiated a sampling programme ofthe Lower Sewa alluvial potential diamond deposits. This project saw thepurchase of a new sampling diamond processing and recovery plant with aninstalled head feed treatment capacity of 12,000 tons of gravel per monththrough a Dense Media Separation ("DMS") module with an x-ray diamond recoveryand sort house. A mining fleet of six dump truck (25 tonners) and two hydraulic excavators (30tonners) was purchased. The processing plant was commissioned at Sumbuya (LowerSewa River) during June 2005 where sampling of the alluvial deposits within theCompany's licence areas commenced. After three months, indications from the kimberlite exploration activitiessuggested that the Middle Bafi River area could be more attractive in terms ofpotential alluvial deposits. The Company, therefore, relocated the whole of thissampling unit (personnel, mining equipment and diamond processing plant) to theKono District. In November 2005, SLDC applied to the Sierra Leone Government (via the Ministerof Mines) for a Mining Lease covering the Middle Bafi River area, in the KonoDistrict. Further to the Company's announcement of 24 January 2006, this application wasapproved and four licences were granted between February and April 2006 over anarea of approximately 160 square kilometres, each at a cost of US$50,000 perannum. Konama Alluvial Mine Development During the first quarter of 2006, the Company purchased the existing AfricanGold & Diamonds SA's operation at Tefiya in the Kono District for approximatelyUS$4.2 million, payable in cash and shares. Assets acquired during thistransaction included a small mining fleet of three dumper trucks, one hydraulicexcavator and a diamond recovery plant. SLDC renamed the operation - the Konamamine. Following this acquisition, SLDC set out to establish an alluvial miningoperation that would have the capacity to process two million tons of alluvialgravels per annum. This project included a substantial upgrade of the diamond processing plantpurchased, replacing all metallurgical components with modern equipment. Acomplete x-ray and diamond sort house was manufactured in South Africa andconstructed at the Konama mine site for a total cost of US$0.72 million. Byusing in house skills, best practice security systems and productionoptimisation techniques the project team constructed and commissioned thisfacility within five months. The mining fleet was also increased to nine dumptrucks (25 tonners) and four hydraulic excavators (30 tonners). The mining fleet has demonstrated its capacity by mining an average of 160,000tons of gravels per month during April, May and June of this year, being thelatter part of the dry season. The base camp facilities were upgraded from basic living quarters to a modernmining camp with housing and office facilities that include satellite internetand communications facilities. This mine development project was carried out at a cost of US$21.0 million.Subsequently, the Company has recently acquired a further fleet of five dumptrucks (40 tonners) and two hydraulic excavators (60 tonners) at a total cost ofUS$2.4 million, that will be applied to waste stripping. This expanded miningfleet has the capacity to move 18 million tons of material per annum. SLDC mine management staff set out to recruit appropriate skilled staff andimplement the systems for operating a large alluvial mine. Operating staff(expatriate and national) were recruited and the number of persons involvedpeaked in the second quarter of 2006 during construction at 768 persons at thealluvial operation together with a total of 237 exploration staff. As at 1November 2006, the Company had a total of 958 staff. The three wash plants at Konama each have a capacity to accept 70 tons per hourof mined diamond bearing gravel and to produce approximately 28 tons per hour ofwashed concentrated material. This is in turn fed to one DMS section that has aninstalled capacity of 100tph. During commissioning, all of these units have beenoperated for sufficient periods such that the Company is satisfied that theoperation will meet its production targets. The Company has recently ordered afourth wash plant, which will take the installed capacity through two milliontons of gravels per annum. As at 25 November 2006, the Company's mining fleet has moved 1,846,342 cubicmetres of material; delivered 851,531 tons of gravel to the wash plants(stripping ratio of 2.25:1); its DMS plant has treated 328,522 tons ofconcentrate and recovered 6,353.66 carats of diamonds (0.7 cpht), since start upat Konama in March 2006. This period encompassed a significant expansion ofcapacity, stripping in advance of mining and general civil works, and as such isnot regarded by the Directors as representative of a steady state operation. TheDirectors believe that an appropriate stripping ratio for the exploitation ofthis deposit may be in the region of 4:1. Diamond sales The Company undertook the sale of its first diamonds in early September 2006with the objective of confirming the security, independent valuation andKimberley Process Certification procedures. The sale of diamonds was fullycompliant with the Kimberley Process Certification and tested the marketvaluation of the diamonds produced up until 23 August 2006, from the Company'salluvial operation. WWW International Diamond Consultants were engaged to carryout the open tender process in Antwerp. The results of the tender and sale of the diamonds were as follows: Tender ResultsDescription Carats (US$) Average US$/ct+10.80 57.15 94,754.70 1,658.005-10ct 67.19 260,473.00 3,876.663-4ct 162.39 222,149.52 1,368.008-10gr 133.89 107,112.00 800.00+2ct 434.87 109,080.00 250.83-2ct 1,099.12 79,136.64 72.003-6gr 489.82 162,130.42 331.00-3gr 558.40 90,222.00 161.57Sub-Total 3,002.83 1,125,058.28 374.67Miscellaneous 1,408.07 53,550.00 38.03 Total 4,410.90 US$1,178,608.28 267.20 In a previous announcement dated 29 June 2006, the Company stated that in itsrecovered diamonds there was a large proportion of special diamonds (greaterthan 10.8 carats per stone). In the sample referred to above, there were fourdiamonds which were specials, which the Directors note do not constitute a largeproportion as previously stated. However, the Directors believe thatinsufficient material has been treated to make the above sales statisticallymeaningful, and the results of this tender are therefore not considered to berepresentative of the average value of the source of the alluvial depositsmined. However, the Company has factored these results into its ongoingdevelopment of a long term marketing strategy which the Directors intend todesign, to optimise SLDC's future revenues from alluvial diamond sales with aview to securing sales in excess of that achieved in the initial auction. Pink diamonds - clarification During the commissioning of the diamond processing plant at Konama and bulksampling of the potential diamond bearing gravels surrounding the operation,SLDC recovered two particular stones from the Middle Bafi River area (KonoDistrict) that were classified by SLDC sorting staff as pink in colour. Giventhe low probability of an occurrence of this type of coloured stone and thepositive indication given by the recovery of such types of diamonds from therelatively small size of sample taken, the Company, in its preliminary statementannounced on 29 June 2006, stated that a significant number of priceless fancies(pink diamonds) of approximately four carats had been recovered. Specifically,the pink stones recovered were a 4.16 carat sawable and a 3.7 carat makable. Following the above mentioned announcement, these two stones along with the restof the diamonds were subjected to an acid cleaning process, but the pink stonesdid not retain their observed colour after this cleaning process. They were,however, included in the parcels that were sold in Antwerp. The Company wishes to clarify that the subsequent acid cleaning of thesediamonds did not, as events turned out, support the statement that there hadbeen a significant number of priceless fancies (pink diamonds) recovered.However, this is not regarded by the Directors as material to the Company'sbusiness. KIMBERLITE EXPLORATION ACTIVITIES SLDC's hard rock exploration activities continue to perform satisfactorily withthe development of a number of prospective projects in all areas of itsoperations. Despite the poor working conditions encountered during the 2006rainy season, work has continued on these projects and is now due to progress tothe next phase of exploration with the commencement of drilling operations madepossible by the ordering of two portable core rigs. North West Region Kagberi During the course of 2004 and 2005, a significant programme was undertaken inthe Kamakwie area in the North West of Sierra Leone following the discovery ofmicro-probe confirmed kimberlitic grains at Kagberi. After further follow up sampling and small diameter drilling, trenches wereexcavated over two proximal anomalies at this site. This trenching resulted inthe recovery of a single 0.41 ct diamond by SLDC from 157m3 of material(including overburden). The trenches were situated in close proximity to the local artisanal workingswithin the anomaly area. SLDC geologists reported the recovery of largerdiamonds by these local workers. Following a preliminary internal interpretation of all available data, theDirectors believe that these diamonds have been released from kimberlite dykesor pipes underlying the area. The Directors also believe that this is the firstindication of a primary kimberlite source in the North West part of the country. Follow up sampling continues in the area including strip sampling to try andextend the anomalies in the greater Kamakwie area. Regional Sampling Following the discovery of micro-probed confirmed Kimberlite Indicator Minerals("KIM") from reconnaissance stream sampling within the North West regionalexploration licence, 30 drainages have been identified for follow up samplingand this is ongoing. It is estimated that at least 600 follow up samples will betaken as part of this programme. HRAM Following interpretation of the HRAM survey, 15 large aero-magnetic anomalieshave been identified in the North West licence area. These are now beingindividually sampled for kimberlite indicators, geochemical samples are alsobeing taken over each anomaly. Further, the aero-magnetic survey has resulted in 183 A-C grade magneticanomalies, some 139 of which have been identified as potential drill targets. North East Region Within the North East of the country, 15 drainages have been identified as beingassociated with micro-probe confirmed KIMs and will be subject to follow upsampling. In addition, five large geophysical anomalies have been identified forfollow up KIM and geochemical sampling, which is expected to commence shortly.Interpretation of the HRAM survey has further identified 37 A to C classgeophysical anomalies over which ground magnetic survey work will be undertakenin order to define potential drill targets. Kono Following the recovery of KIM from the reconnaissance programme in the Kono areain the early part of 2006, 44 drainages have been identified for follow upsampling (some 800 samples). The follow up work has commenced and 35 per cent.of the samples have been taken and the Company is awaiting the results.Strip sampling has also been undertaken around the extensions to the known Konodykes on SLDC held ground as well as in the area around the village of Bumpe,where G10 and G9 garnets have been recovered by SLDC, in order to define thesize and extent of this anomaly. As previously reported, the first follow up samples from the Bumpe anomalycontained many KIMs within the six samples taken within the licence area alongapproximately 750m of drainage. The detailed KIM results from these are shownbelow: Sample No. Visual results Ilmenites Garnets Chromites Micro-diamonds 1 100+ 51 13 0 2 500+ 17 11 0 3 500+ 20 33 1 4 246 20 2 1 5 97 1 0 0 6 75 0 0 0 Total 109 59 2 All of the above grains were recovered at the SLDC laboratory in Bo. Extracts ofthese samples were sent for probing at Mike Scott & Associates in Johannesburg,South Africa (an independent laboratory which specialises in services for thediamond exploration industry) with the following results:Sample Microprobe results No. 1 32 G10 Garnets, 2 G9 garnets 15 eclogitic garnets, 6 kimberlitic ilmenites and 8 kimberlitic chromites (3 falling within the diamond inclusion field) 2 9 G10 garnets, 1 G9 garnet, 7 eclogitic garnets, 7 kimberlitic ilmenites and 9 kimberlitic chromite (1 chromite in the diamond inclusion field) 3 12 G 10 Garnets, 3 G9 garnets, 3 eclogitic garnets, 7 kimberlitic ilmenites and 21 kimberlitic chromites (6 chromites in the diamond stability field) 4 12 G10 garnets, 1 G9 garnet, 7 eclogitic garnets and 6 kimberlitic ilmenites 5 3 kimberlitic ilmenites 6 14 kimberlitic ilmenites Strip sampling by the Company continues to define and produce positive samplingresults and exploration trenching of these anomalies is expected to start earlyin the New Year. In an attempt to speed up the definition of these anomalies, Resonance AcousticProfiling is being trialled to identify the size and shape of the underlyingfeatures with the aim of generating further drill and sampling targets in thisarea. The Company has discovered diamondiferous primary kimberlite source rocksfrom bulk sampling results of other kimberlite dykes in this vicinity, asreported by the Company in 2005. HRAM Within the Kono region, 11 large magnetic anomalies have been identified forKIM, geochemical sampling and test drilling. A further 20 A -C class anomalieshave been identified for ground magnetic survey work. Lake Popei As previously announced on 17 November 2006, a total of 20 samples have beentaken along two drainages in this 54 km2 low lying block of ground. Thesesamples were dispatched to the Bo laboratory where amounts of visuallykimberlitic ilmenites were recovered and stripped from the sample concentrates.In one case, a count of over 3,000 ilmenite grains were recovered and in all butone of the samples, visually kimberlitic ilmenites were recovered. The presenceof coarse ilmenite grains and the comparatively un-abraded surface textures ofthese grains indicated to SLDC's in house experts, a proximal source rock. 599of these ilmenite grains were dispatched to Mineral Services Laboratories("MSL") for mineral chemistry analysis to confirm the in-house visual results.MSL is based in Cape Town, South Africa and is an independent laboratory whichspecializes in services for the diamond exploration industry. The results of this analysis have been received and confirm that these grainsare derived from a kimberlite source rock. All but one of the ilmenite grainshave been classified as kimberlitic in origin based on their chemicalcomposition (a copy of the MSL report is available on the Company's website). Although no direct inference can be made from the presence of these grains tothe potential diamond content of the source rock, the Directors are highlyencouraged by these positive results from an area with known artisanal workingsand no previously documented kimberlite source rock. Field teams are currently being established at this site to undertake stripsampling, follow up drainage sampling and further reconnaissance sampling withinthis licence area to define the size and shape of this anomaly with the aim ofgenerating defined drilling targets and trench sites. Sewa Block Within the Sewa licence block, 20 drainages have been identified for furtherfollow up sampling following the recovery of micro-probe confirmed KIMs. A 500sample programme is envisaged. In addition, 45 drill targets have beenidentified from airborne and ground geophysical surveying. Drilling is plannedto commence early in the first quarter of 2007, following delivery of theportable core rigs that have been recently ordered. Coastal Licences Reconnaissance sampling of the Coastal licence block has had to be postponed dueto the local field conditions during the rainy season. However, the Companycontinues to analyse results from the SLDC laboratory which are slowly becomingavailable as priority is being given to samples from other licences, includingLake Popei. There are five large aero-magnetic targets within this block oflicences identified for follow up work and potential drilling as well as 102 A-Cclass anomalies. Of the 102 anomalies, six have been identified as drill targetsto date. Gori Hills 10 drainages have been identified for follow up sampling within this area (110samples). Airborne geophysical surveying has not been undertaken over theselicences due to the high magnetic background of the area. The Company is not in a position to declare any resources or reserves in itskimberlite portfolio at present. IRON ORE In the preliminary announcement of audited financial statements for the yearended 31 December 2005, released in June 2006, a statement was made that 'theindependent technical review carried out by Snowden Industry Mining Consultants,in 2005, indicates the presence of a significant iron ore deposit (estimated55%-60% hematite iron ore lump) of 1bn tonnes. This was based on a previousfeasibility study carried out by LKAB (UK) in 1972'. This was not correct andtherefore the following clarification and update is included below. In July 2004, a report was issued by the Sierra Leone Geological Survey entitledthe "Mineral Potential of Sierra Leone". This report, which is available on theCompany's website, refers to both the Tonkolili and Marampa Iron ore deposits.In the case of the Tonkolili deposit, this report states that a resourceestimate of 120 million tonnes (assuming a three metre cap) exists at a grade of56.3% Fe in the overlying enriched cap and at least 600 million tonnes for theprimary orebody. A SLDC in house interpretation of aero magnetic data haspostulated an increased area of mineralization showing potential for 1 billiontonnes of ore (assuming a 10m thick ore body). These estimates do not yetconform to modern resource and reserve standards, such as JORC, SAMREC or CIM. In the case of Marampa, an estimated tonnage of 92 million tonnes of primary oreis quoted at 37.8% Fe by the Sierra Leone Geological Survey on the existing minelease area. The Company does not own this mine lease but holds all groundsurrounding the mine lease and believes that the following both internal andexternal geophysical interpretations that the primary ore body extends beyondthe mine lease area and into the 330 sq.km exploration licence held by SLDC. Initially, the Company commissioned Snowden Industry Mining Consultants (Pty)Limited to undertake a desk top study on documentation generated by the previousowners of the Tonkolili and Marampa Iron Ore Mine. This study, published inSeptember 2005, included the historic inferred resource statement for Tonkoliliof 120 million tonnes at 56 per cent Fe. This statement is not, however,compatible with current compliance guidelines due to the lack of original sourcedata. As announced on 1 November 2006, RSG Global Limited ("RSG"), theindependent technical consultants, were therefore tasked with undertaking asampling and compliant resource definition campaign to determine the iron orepotential of the Company's Tonkolili and Marampa licences. Sampling at Tonkolili has progressed well with over 5,700 surface trench sampleshaving been taken and 1,100 samples from the previously existing sampling adits.These samples are being treated by the independent consultants SGS'slaboratories, in Guinea and Johannesburg, and the first results are due by theend of November 2006. Samples are now being taken to infill the preliminarysampling lines to a uniform 600m spacing. A reinterpretation of the airborne geophysical data from both Tonkolili andMarampa has also been completed by RSG. From this, RSG identified 11 potentialhematite targets at the Marampa site. In the case of Tonkolili, RSG reportedthat the 'highly magnetic banded ironstones suggest a substrate comprised ofmagnetite' and that the 'highly magnetic zone identified within the SLDCconcession strikes up to 12km, varying from 100m to 1.5km in width (thesedimensions are supported by current geological mapping being undertaken by RSGstructural geologists)'. Following the above geophysical report the areas have now both been groundtruthed and structural field mapping has been undertaken to allow the generationof a drilling programme that is scheduled to commence during the first quarterof 2007 at both sites. A final proposal from RSG in this regard is due shortly. The aim of this work is to validate and extend the work that was undertakenprior to the Civil War and to generate a compliant resource statement for bothdeposits by mid 2007. GOLD Following an assessment of the report dated June 2005, generated by AFWilkinson, an independent geological consultant, concerning the potential forgold mineralisation within the SLDC licences, RSG have been tasked withcompiling a geochemical sampling programme over the Sula Mountains (Tonkolili),Loko Hills, Gori Hills and Nimini Hills (all of which have been identified asGreenstone belts and are or have been associated with artisanal gold workings). Crews to undertake this work are due in Sierra Leone before the end of November2006 and an initial programme of some 8,000 samples is planned. CONCLUSION The Directors anticipate that following the recent end of the wet season andsubsequent expansion in alluvial production, that revenues from sales willexceed the Company's operating costs during the first quarter 2007. TheDirectors are encouraged by the progress made to date and look forward tocontinuing momentum across the series of activities highlighted in thisannouncement. Enquiries:Sierra Leone Diamond Company Limited Tel: +44 (0) 1442 257 246David Gadd ClaxtonGordon Stein Canaccord Adams Limited Tel: +44 (0) 20 7050 6500Mark AshurstMike Jones Buchanan Communications Tel: +44 (0) 20 7466 5000Bobby MorseBen Willey Notes: The information in this report that relates to Exploration Results, MineralResources and or Ore reserves is based on information compiled by P I Young, Pr.Sci Nat (reg. No 400270/05), who is a Member of the Geological Society of SouthAfrica. Paul Young is a full time employee of the Company and meets therequirements as a qualified person for the purposes of the AIM Guidance Note onMining, Oil and Gas dated March 2006 in terms of the diamond industry.It should be noted that potential quantities in this report are conceptual innature and insufficient exploration has been undertaken to define a MineralResource and it is uncertain if further exploration activities will result inthe determination of a Mineral Resource. Glossary of Terms A - C class A semi-quantitative method of ranking the 'quality' of aanomolies geophysical anomaly depending upon the relative strength of the signal received. Anomalies may be ranked 1 to 5 or A to E depending upon the individual undertaking the data interpretation. Cpht Carats per hundred tonne - a measure of grade. Ct Carat - a measure of diamond weight. 1 carat = 0.2 grammes. Drainages A drainage is defined as that area which is drained by a stream or network thereof. DMS Dense Media Separation. A method of concentrating diamonds based on the relatively high natural density of diamond as opposed to the host material. G9 garnets The G classification for garnets is a method of classification that uses the ratio of calcium and chrome within the garnet grain and indicates the derivation of the grain from within the earth's mantle. This is empirically linked to the pressure and temperature conditions of the mantle and likelihood of diamond formation G10 See above.garnets Fe Chemical symbol for Iron. Head feed The amount of Run of Mine material that be processed by a treatmenttreatment plant usually expressed in either tones per hour or cubic metrescapacity per hour. HRAM High Resolution Aero-Magnetic Survey - a closely spaced series of air-borne survey lines flown to measure differences in the magnetic properties of the earth. Makable A classification of rough diamond pertaining to shape and potential for cutting. A makable is a rough diamond from which a single polished diamond can be cut Mcts Million carats. Resonance A ground based geo-physical survey tool that measures the differingAcoustic response between rock types in terms of sound wave frequencyProfiling transfer. Stripping Tonnes of waste required to be moved to mine a tonne of ore.ratio Strip Closely spaced sampling of surface material along a predeterminedsampling line. Used to define positions of kimberlite dykes or pipes. Sawable A classification of a rough diamond pertaining to its shape and potential for cutting. A sawable rough diamond is capable of being sawn during the cutting process thus allowing two polished stones to be manufactured from a single rough stone. Wash plant A piece of machinery for the washing of gravel to remove fines and in some cases coarse material. Washed Material that has been washed and concentrated within a diamondconcentrated treatment plant. i.e. fines and coarse material have beenmaterial removed. This information is provided by RNS The company news service from the London Stock ExchangeRelated Shares:
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