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首页> 外文会议>Eighth international mining geology conference 2011. >Alluvial Gold Mining – A Modern Day Gold Rush on the West Coast
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Alluvial Gold Mining – A Modern Day Gold Rush on the West Coast

机译：冲积金矿–西海岸的现代淘金热

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The west coast of New Zealand’s south island is host to a large number of placer goldfi elds thatrnstretch from the Westport area in the north to Gillespies Beach in the south and inland to thernfoothills of the Southern Alps. This area is host to a large number of alluvial, glacial and strand linerndeposits ageing in range from Recent to Tertiary. In recent years exploration models have beenrndeveloped for off shore placer deposits on the continental shelf.rnGold mining on the west coast has exploited placer gold resources from the 1860s to present,rnand with the recent surge in the gold price the industry is currently undergoing a resurgence. Therncurrent increase in mining is dominated by small-scale mechanical operations usually involvingrnone to two people at each site; a few larger operations also exist such as the Grey River Dredge.rnMining methods range from using fl oating bucket dredges to small diggers. Some of the miningrntechnologies used are similar to those employed during the great gold rushes of the 19th century.rnExploration and grade control techniques can be very rudimentary often relying on previousrnsampling programs or wide spaced bulk sample drill holes. Some bulk sample drilling is usedrnon the larger operations as a form of grade control, most of the small operations tend not to usernany ore control sampling prior to mining. Extraction techniques relying on simple gravity basedrndesigns with riffl e tables or spirals are the most commonly used.rnEnvironmental standards are very high within New Zealand and require operators to returnrnmined areas to preagreed to landforms. The high rainfall experienced on the west coast causesrnchallenges to operators in regard to water quality. Technical issues combined with often limitedrncapital provide for challenges to the operations.
机译：新西兰南岛的西海岸拥有大量砂金矿场，这些砂矿场从北部的韦斯特波特地区延伸到南部的吉勒斯皮斯海滩，再到内陆到南阿尔卑斯山的山麓丘陵。该地区拥有大量的从新近到第三纪的冲积，冰川和股线沉积物。近年来，已经开发出了针对大陆架近海砂矿的勘探模型。rn西海岸的金矿开采从1860年代至今一直利用砂金资源，并且随着近期金价的上涨，该行业目前正在复苏。采矿业目前的增长主要由小规模的机械作业所主导，通常每个作业现场要有两个人丧生。还存在一些较大的作业，例如Gray River Dredge。采矿方法的范围从使用浮斗式挖泥机到小型挖掘机。所使用的一些采矿技术与19世纪的淘金热期间使用的技术类似。勘探和品位控制技术可能非常基础，通常依赖于以前的采样程序或宽间隔的大块样本钻孔。某些大型样品钻探是不采用较大的操作作为等级控制的一种形式，大多数小型操作往往在采矿之前不对用户进行矿石控制。最常用的是依靠简单的基于重力的设计（带有浅表或螺旋形）的提取技术。在新西兰，环境标准很高，要求操作员将采雷区放回地面以适应地形。西海岸的高降雨给操作员带来了水质方面的挑战。技术问题加上通常有限的资本给运营带来了挑战。

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