|The Copper King - a gold mine or just another hole in the ground?|
|Pervasive propylitic alteration of granitic rock collected in the Silver Crown|
district by the author, 1982.
Personally, I've investigated this property a number of times as a researcher and as a consultant. My initial reconnaissance in 1978 led to grants by the University of Wyoming Mining and Minerals Resource Research Institute (MMRRI) to the Minerals Section of the Wyoming Geological Survey to investigate geophysical and geochemical signatures of a group of diamondiferous kimberlites in the Colorado-Wyoming State Line district, search for new kimberlite deposits, and also search for disseminated metal deposits in Wyoming for the University of Wyoming to conduct heap leaching and in situ metallurgical research. At the time, geologists with the Wyoming Geological Survey investigated several deposits around the state, but the Copper King was the most favorable for this kind of research. Sampling and mapping of the Rambler Mine was conducted on the Bill Ferguson Ranch in the Silver Crown district, and mapping of the Copper King mine on state land (Hausel and Jones, 1982; Hausel 1997). Ferguson (1965) previously sampled the Rambler Mine and provided us with assay reports. Over the years, I also identified visible gold in rock samples on the property - something previously unrecognized.
|Potassic alteration at the Copper King mine|
|Hydrothermally altered rock at the Rambler prospect|
But a couple of things to think about - one is that this is a deeply eroded gold-copper deposit, and some of that gold eroded in the past 60 million years must be somewhere downstream. In addition, diamondiferous kimberlites in the nearby State Line district as well as scattered throughout the Laramie Range are also deeply eroded and as much as 2,500 feet of diamondiferous kimberlite pipes also eroded and those diamonds must be somewhere downstream in the Poudre River and other drainages.