Composition of Gold from Southwestern British Columbia: a Progress
نویسنده
چکیده
This account gives new data on the composition of gold from various lodes and placers in southwestern British Columbia. This research is a continuation of work reported in a 1986 paper (Knight and McTaggart, 1986). This account repeats some of the introductory material of the earlier paper in order to clarify the present report. A main objective of this work is to characterize gold by its suite of minor elements; with gold from different sources thus fingerprinted, one can attempt to trace the path of gold from lode to placer. In addition, the composition of lode gold is a parameter which may he used in the genetic classification of gold deposits. The study of placer gold textures is expected to yield information on conditions and distance of travel. Placer and lode gold are rarely if ever pure, but are alloyed with other elements such as silver, copper and mercury. Early studies on gold composition and its significance were made before the electron microprobe was developed and Boyle (1979) provides an exhaustive account of this research. One of the early studies is that of Warren and Thompson (1944) who spectrographically analysed gold from many areas, mainly British Columbia. Holland (1950) lists gold-silver ratios for many placers in the province. Microprobe studies include those of Desborough (1970) who has studied placer gold from many localities in the United States and Giusti (1983) who reported placer gold compositions from Alberta, Canada. This paper presents new compositional data on eight lodes and eight placer deposits and the reader may find it useful to compare these results with those of the earlier work (Knight and McTaggart, 1986).
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