Estimating sulphide ore grade in broken rock using visible/infrared hyperspectral reflectance spectra
Estimating sulphide ore grade in broken rock using visible/infrared hyperspectral reflectance spectra
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DOI：
10.1080/01431160110075604
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发表时间：
2002-06-01
影响因子：
3.4
通讯作者：
Francis, H
中科院分区：
文献类型：
--
作者：
Gallie, EA;McArdle, S;Francis, H
高光谱遥感领域发展迅速，用于从机载平台进行广泛的矿物测绘。本研究的目的是检查高光谱光谱法（0.35-2.5妈妈）是否可以在地下采矿环境中使用映射的岩石面，手标本和岩心记录的硫化矿的品位。从安大略萨德伯里盆地的矿山中收集了自然破碎的贫瘠和含矿岩石样品，并测量了干和湿反射率。硫化物矿物在短波长处显示出单侧吸收带，称为电导带。羟基轴承硅酸盐表现出三重吸收功能附近2.3妈妈。有两个比率，一个描述电导带，一个描述羟基带，可用于从贫瘠和低品位岩石中分离高品位矿石（> 20-25%硫化物）。电导带比也可用于估计单独黄铜矿的浓度，+/-15%黄铜矿，绝对值。误差与磁黄铁矿和镍黄铁矿的浓度成正比。如果用其他方法估算硫化物总量，误差可以减少，一项平行研究表明，使用热反射波长是可能的。该研究表明，利用高光谱工具对硫化物矿石进行分级的潜力很大。
The field of hyperspectral remote sensing has developed rapidly for widespread mineral mapping from airborne platforms. The purpose of the current study was to examine whether hyperspectral spectrometry (0.35-2.5 mum) can be used in an underground mining environment for mapping the grade of sulphide ore in rock faces, hand specimens and core logging. Naturally broken samples of barren and ore-bearing rocks were collected from mines in the Sudbury Basin, Ontario, and dry and wet reflectance were measured. The sulphide minerals exhibit a one-sided absorption band at short wavelengths known as a conductance band. The hydroxyl-bearing silicates exhibit a triple absorption feature near 2.3 mum. Two ratios, one describing the conductance band and one describing the hydroxyl band, can be used to separate high grade ores (> 20-25% sulphides) from barren and lower grade rocks. The conductance band ratio can also be used to estimate the concentration of chalcopyrite alone, +/-15% chalcopyrite, absolute. Errors are proportional to the concentration of pyrrhotite and pentlandite. Errors can be reduced if total sulphides are estimated by other means, which a parallel study indicates is possible using thermal reflectance wavelengths. The study indicates that there is a high potential to use hyperspectral tools to grade sulphide ores.