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首页> 外文会议>PACRIM Congress >High-grade Porphyry Copper-gold Mineralisation in North-west Ecuador- The Alpala Cu-Au Porphyry Discovery
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High-grade Porphyry Copper-gold Mineralisation in North-west Ecuador- The Alpala Cu-Au Porphyry Discovery

机译：西北厄瓜多尔的高档斑岩铜金矿化 - Alpala Cu-Au Porphyry Discovery

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The Alpala copper-gold deposit is a recent, high-grade porphyry Cu-Au discovery located in the Imbabura Province of north-western Ecuador. The deposit lies along the crustal-scale Chimbo-Toachi Fault Zone within the Dagua-Pihon terrane, which is an oceanic plateau accreted to the South American convergent margin in the Late Cretaceous. The deposit is hosted by quartz diorite stocks that intrude andesitic volcanic breccias of the Oligocene to mid-Miocene San Juan de Lachas Formation. Miocene-age calc-alkaline plutonism is associated with porphyry Cu, Cu-Mo and Cu-Au deposits in southern and northern Ecuador. The Alpala deposit lies along a sector of the Miocene arc that has recently been underplated by the Carnegie Ridge seamount chain that induced shoaling of the subducted Nazca plate beneath northern Ecuador.Surface expressions of the deposit were recognised in May 2012 during follow-up of stream sediment anomalies, when outcropping sheeted and stockwork porphyry-related veins were discovered in Quebrada Alpala. The roots of a NW-trending, structurally-controlled lithocap were recognised over an area of 4.5 x 0.9 km. The remnant lithocap exhibits well-defined mineral zonation mapped by TerraSpec~(TM) analyses on grid soil samples. Soil sampling, heliborne magnetic surveying and channel sampling defined initial drill targets.Seven diamond drill holes were completed in the year from September 2013. Drill hole CSD-13-005 intersected 672 m grading 0.93 per cent Cu and 0.91 g/t Au in high-temperature, inner propylitic and locally potassic-altered quartz diorite intrusions. Overlying hydrothermal clay alteration assemblages define the base of the lithocap. A NW-SE trending footwall structure defines the south-west margin of the deposit. Drill hole 5 intersected high-grade sheeted T3-type' and 'C-type' veins (Gustafson and Hunt, 1975) that lie along the south-west margin of an 1100 x 500 m magnetic anomaly that is the focus of ongoing exploration.
机译：Alpala铜金矿床是近期高档的斑岩铜奥 - 奥 - 奥布尔省，位于厄瓜多尔北部伊巴伯省。矿床沿着DAGUA-PIHON TERRANE内的地壳尺寸CHIMBO-TOACHI断层区，是一只海洋高原，在后期白垩纪的南美会聚边缘。该押金由石英二霰山股托管，该股票侵入了少茂的羊毛菌Breccias至中间烯酮San Juan de Lachas形成。中茂钙碱钚与南部和北部南部和北部的斑岩Cu，Cu-Mo和Cu-Au沉积物有关。阿尔巴拉矿床沿着新世纪弧部门的部门，最近被卡内基岭山脉链条所加入的，该链条诱导厄瓜多尔北部北部核心的纳斯卡板的浅层。押金的表面表达于2012年5月在流动的后续行动期间确认沉积物异常，当在Qubrada Alpala发现了露面的铺砌薄膜和有关斑岩相关的静脉。 NW趋势，结构控制的Lithocap的根源被认可，面积为4.5×0.9公里。残余的Lithocap在网格土壤样品上呈现由Tradaspec〜（TM）分析的明确定义的矿区。土壤采样，Heliborne磁测量和通道采样定义的初始钻孔目标。钻石钻孔于2013年9月的年度完成。钻孔CSD-13-005相交672米，高0.93％的Cu和0.91克/吨Au - 温度，内丙基和局部母母改变的石英侵入侵入性入侵。覆盖的水热粘土改变组件定义了Lithocap的底部。 NW-SE趋势鞋结构定义了矿床的西南边缘。钻孔5相交的高档纸张T3型'和'C型'静脉（Gustafson和Hunt，1975），沿着西南部的1100 x 500米的磁性异常展示，这是正在进行的探索的焦点。

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