The Highland Valley Copper (HVC) district in British Columbia, Canada, is host to at least four major porphyry Cu systems: Bethlehem (~209 Ma), and Valley, Lornex, and Highmont (~208 to 207 Ma). High spatial resolution (0.2–1.0 mm/pixel) hyperspectral imagery in the shortwave infrared (SWIR) were acquired on 755 rock samples and 400 m of continuous drill core. Spectral metrics are used to measure the relative abundance of 12 minerals and an additional metric is derived to estimate white mica grain size. In the Valley and Lornex deposits, coarse-grained white mica is associated with mineralization and is detectable up to 4 km away from the deposits. Kaolinite is present within 2 km of the mineralized centers but does not necessarily occur within strongly mineralized intervals. Prehnite is ubiquitous from 4 to 8 km from the deposits. In the Bethlehem deposit, tourmaline and epidote are associated with mineralization. We propose a spectral alteration score based on these proximal hyperspectral SWIR mineralogical patterns to assist explorers in targeting porphyry Cu systems when using drill core, surface rock samples and potentially remote sensing imagery. In a production environment, this metric could serve to facilitate ore-sorting.

中文翻译：

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利用高光谱成像表征高地山谷斑岩铜矿区的矿物学及其潜在应用

加拿大不列颠哥伦比亚省的高地谷铜（HVC）区至少拥有四个主要的斑岩铜矿系统：伯利恒（〜209 Ma），Valley，Lornex和Highmont（〜208至207 Ma）。在755个岩石样本和400 m连续钻芯上获得了短波红外（SWIR）的高空间分辨率（0.2–1.0 mm /像素）高光谱图像。光谱度量用于测量12种矿物质的相对丰度，并推导了另一个度量来估计白云母的晶粒尺寸。在Valley和Lornex矿床中，粗粒白云母与矿化有关，并且在距矿床最远4 km处均可检测到。高岭石存在于矿化中心的2 km之内，但不一定发生在强烈矿化的间隔内。矿床到矿床四到八公里处普遍存在。在伯利恒矿床中，电气石和埃迪奥特与矿化有关。我们建议基于这些近端高光谱SWIR矿物学模式的光谱蚀变评分，以在使用钻芯，地表岩石样品和潜在的遥感影像时，帮助勘探者锁定斑岩Cu系统。在生产环境中，此度量标准可用于促进矿石分类。