金礦選址地質(zhì)資料翻譯-中英對照
哈薩克斯坦
Trenches: Aleksandrovskoye 地區(qū)：KULUDJUN礦床
為KASKADN提供技術(shù)回顧
2007年2月
英國 CF10 3BN，加的夫區(qū)，格羅夫公園12號，1樓，
Kaskad N SRK 探索服務(wù)
執(zhí)行摘要
SRK 勘探服務(wù)公司（簡稱SRKES）受邀協(xié)助指導(dǎo)Kaskad N 完成其在哈薩克斯坦東北地區(qū)所有Kuludjun 金礦產(chǎn)業(yè)的技術(shù)回顧。本技術(shù)回顧包括全部的地址資料，用以對勘探潛能及蘇聯(lián)資源進行評判；通過參照最佳經(jīng)驗方法和JORC準則對勘探和鉆探方法進行評價；同時，對規(guī)劃完成的樣品備制設(shè)備進行回顧。
十九世紀60年代，砂金在Kuludjun河及其支流被發(fā)現(xiàn)，進而開采出大約300千克黃金。黃金巖床的源頭早在二十世紀伊始就被人們發(fā)現(xiàn)，并在二十世紀20和30年代就對其進行了探測，勘探結(jié)果顯示其黃金產(chǎn)量高達3公噸以上。到二十世紀40年代末，使用水銀提取工藝從淺埋立井和與坑道中產(chǎn)出的黃金總量大約為3公噸。
Kuludjun 在結(jié)構(gòu)上受約束，屬于中溫金礦床，誕生于早前石炭紀的變質(zhì)沉積巖石中。原生礦物于石英礦脈相結(jié)合，平鋪形成網(wǎng)脈石英脈紋和細脈帶，長度可能有數(shù)十米寬。個別的石英礦脈寬達2米，且圍巖的硅化作用局部性強。
淺生金礦的出現(xiàn)正如石英礦脈中的游離金一樣與含砷的黃鐵礦相結(jié)合。游離金也會出現(xiàn)在氧化環(huán)境中，是歷史上礦床開采的主要目標。含有游離金的礦石應(yīng)該能經(jīng)受住氰化物的堆攤浸出實驗。對含金的石英鎢錳鐵礦白鎢礦脈進行局部開發(fā)。
對Kuludjun礦床的全面開采和鉆探始于二十世紀50年代至80年代末，開采工作由接連不斷的蘇聯(lián)探險隊完成。結(jié)果發(fā)現(xiàn)，距地表250米深處有12公噸黃金的C1+C2資源，25公噸黃金的P1資源和19公噸黃金的C1+C2+P1未定義資源。經(jīng)證實，24公噸的P1資源來自于距地表250至500米深處。計算方法是截斷1g/t黃金，采用3至9g/t黃金之間的平均等級。
SRKES尚未證實蘇聯(lián)數(shù)據(jù)資料或方法的準確性，除了標注出哪些資源種類不符合JORC標準外，SRKES無法對蘇聯(lián)資源的有效性進行評判。而且，1996年Vost Kaz Nedra 報告指出蘇聯(lián)在Kuludjun的資源應(yīng)僅被視為是一個估計值，有待進一步的探測從而轉(zhuǎn)化為合適的GKZ范疇，并允許內(nèi)含物進入國家平衡表中。
2006年8月，Kaskad N 獲得一份6年的勘探許可和一份14年的采礦許可證，并且已經(jīng)完成了一項涉及地質(zhì)填圖的一次勘探項目，5，554米直線長的挖溝工作和10，438米金剛石鉆孔。2006年勘探項目集中于Kuludjun11個已知勘探方面中的3項上。
2006年，對部分Kaskad N鑿洞的初步化驗結(jié)果表明，蘇聯(lián)的分級之間聯(lián)系緊密且良好，并證實在接近地表處存在等級2至20g/t金的氧化物金礦存在。Veseloe 勘探前景的Kaskad N 鉆探密度應(yīng)該與JORC的礦產(chǎn)資源預(yù)算項符合。
野外制圖、挖溝，鉆探及地質(zhì)取樣的質(zhì)量良好，且樣品正在喀拉巴爾塔的分析專家亞歷克斯•斯圖爾特手中接收化驗。Kaskad N 必須開發(fā)一種更新的質(zhì)保/指控協(xié)議，協(xié)議包括對質(zhì)量控制空白處的內(nèi)容插入，分階段的復(fù)制品以及驗證合格的參考材料。
Kaskad N為Kuludjun執(zhí)照支付了50萬美元，并且已經(jīng)同意再支付911，780美元（歷史的勘探成本）以及接下來的20多年中，用于各種社會和地區(qū)性發(fā)展的勘探項目590萬美元。
Kuludjun技術(shù)評估： SRKES 7119 第I頁
Kaskad N SRK 探索服務(wù)
Kaskad N 還承諾另外支付一筆6年以上勘探的花費，總計580萬美元。在每年委托事項中，挖掘，金剛石鉆孔以及一些地下開發(fā)的直接勘探成本占絕大部分。
SRKES認為Kuludjun執(zhí)照對獲得進一步的重大發(fā)現(xiàn)來說不失為是一種先進的工具。進一步的勘探將受益于蘇聯(lián)已經(jīng)建立的龐大數(shù)據(jù)。SRKES的觀點是購買價格和總的勘探花費比例應(yīng)該合理且應(yīng)對勘探項目有良好的規(guī)劃和設(shè)計。
SRK Exploration Services
KULUDJUN GOLD DEPOSIT
KAZAKHSTAN
Trenches: Aleksandrovskoye Zone: Kuludjun Deposit
A Technical Review Prepared For
KASKAD N By SRK Exploration Services Ltd February 2007
SRK Exploration Services Ltd, First Floor, 12 Park Grove Cardiff, United Kingdom CF10 3BN Tel: +44 (0) 29 2023 3233 FAX: +44 (0) 29 2023 3211 email: admin@srkexploration.com URL: www.srkexploration.com
EXECUTIVE SUMMARY
SRK Exploration Services (SRKES) were asked by Kaskad N to conduct a technical review of their wholly owned Kuludjun gold property is northeast Kazakhstan. This included a review of all available geological data in order to comment on exploration potential and Soviet resources; comment on exploration and drilling methodology with reference to Best Practice and JORC compliance; and a review of the planned sample preparation facility.
Placer gold was discovered in the Kuludjun river and associated tributaries in the 1860’s and approximately 300 kilograms was eventually produced. The bedrock source of the gold was discovered in the early 1900’s and exploration in the 1920’s and 1930’s resulted in delineation of over 3 tonnes of gold. By the late 1940’s approximately 3 tonnes of gold had been produced from shallow shafts and adits using mercury extraction techniques.
Kuludjun is a structurally-controlled, mesothermal gold deposit, hosted in Early Carboniferous metasedimentary rocks. Primary mineralization is associated with quartz lodes and sheeted to stockwork quartz vein and stringer zones, which may be tens of metres wide. Individual quartz lodes are up to two metres wide and silicifi cation of the wallrocks is locally intense.
Supergene gold occurs as free gold in quartz lodes and in association with disseminated arsenical pyrite. Free gold is also present in the oxide zone and was the main target of the historic bedrock mining. Ore containing free gold should be amenable to cyanide heap-leaching. Auriferous quartz-wolframite-scheelite veins are locally developed.
The Kuludjun Deposit was extensively explored and drilled in the 1950’s to late 1980’s by a succession of Soviet expeditions. This resulted in the delineation from the surface to a depth of 250 metres of a C1+C2 resource of 12 tonnes of gold, a P1 resource of 25 tonnes of gold and an undefined C1+C2+P1 resource of 19 tonnes of gold. A P1 resource of 24 tonnes was cited from 250 to 500 metres depth. Calculations were based on a cut-off of 1 g/t Au using average grades of between 3 to 9 g/t Au.
SRKES has not verified the Soviet data or methodology and cannot comment on the validity of the Soviet resource except to note that the resources are not JORC compliant. Moreover, a 1996 Vost Kaz Nedra report indicated that the Soviet resources at Kuludjun should be considered as estimates only and that further exploration is required to convert the resources into an acceptable GKZ category which will allow inclusion into the State Balance.
Kaskad N were granted a six year exploration licence and a 14 year mining licence in August 2006 and have already completed a first pass exploration programme involving geological mapping, 5554 linear metres of trenching and 10,438 metres of diamond drilling. The 2006 exploration programme concentrated on three of the eleven known prospects at Kuludjun.
Preliminary assay results for some 2006 Kaskad N holes show good correlation with Soviet grades and substantiate the existence of near surface oxide gold mineralization with grades of between 2 to 20 g/t Au. The density of the Kaskad N drilling at the Veseloe Prospect should be sufficient to allow the estimation of a JORC compliant mineral resource.
The quality of the field mapping, trenching, drilling and geological sampling is good and samples are presently being assayed at Alex Stewart Assayers in Kara Balta. However, Kaskad N must develop a more robust QA/QC protocol which should include the insertion of quality control blanks, staged duplicates and certifi ed reference materials.
Kaskad N paid USD 0.5 million for the Kuludjun Licence and have agreed to pay a further USD 911,780 (historical exploration costs) and USD 5.9 million for various social and regional development programmes over the 20 years of the exploration and mining licences. Kaskad N have committed an additional USD 5.8 million in exploration expenditure over the six years of the exploration licence. A signifi cant percentage of the annual commitments are direct exploration costs assigned to trenching, diamond drilling and some underground development.
SRKES considers that the Kuludjun Licence is an advanced exploration property with a significant likelihood of further discoveries. Future exploration will benefit from the very large Soviet data set. SRKES is of the opinion that the purchase price and total exploration expenditures are justified and that overall the planned exploration programme is well designed.
2012.12.24