|Outline of the Wyoming Craton (basement rocks of Archean [>2.5 |
billion years old] age) showing locations of known kimberlites,
lamproites, lamprophyres, diamonds, anomalies (Hausel, 1998).
|Map compiled by Hausel (1998) showing known kimberlite, lamproite,|
lamprophyre and diamond occurrences in the US.
|Location map of the Smoky Butte dike complex |
(from Mitchell and Bergman, 1991).
|Elk Butte lamproite breccia (photo by the author).|
|Ming Bar monchiquite from Montana. Possible source of diamonds? Diamonds or no diamonds, I discovered gem-quality|
peridot and pyroxene at Ming Bar which had been completely overlooked by prospectors. This intrusive sits on the edge
of the Missouri River and likely has shed many other gemstones. Photo by the GemHunter.
|Kimberlites and lamprophyres in the Grassrange field|
|Elk Creek Butte & Yellow Water Butte |
lamprophyres (from Mitchell and
|Sample of Yellow Water Butte lamproite breccia (photo by the author).|
|Map of the Williams kimberlites near Zortman, |
central Montana (after Hearn and McGee, 1983).
|Sample of Williams hypabyssal facies kimberlite, Montana (photo by the author).|
|Froze-to-Death Butte lamproite breccia, Montana (photo by the author).|
|Diamond-rich kimberlite at Victor, Ontario, Canada (photo by the author).|
|Snap Lake kimberlite from Snap Lake diamond mine, NWT, Canada (photo|
by the author).
|Highwall of Kelsey Lake diamond mine, Colorado (photo by the author)|
Diamond-bearing kimberlite at Sloan Ranch, Colorado (photo by the author).
|If you are prospecting for gold in Montana, get to know the |
characteristics of diamond so you don't miss the mother lode
of diamonds. This photo is taken of the surface of an octahedral
diamond surface showing the common trigons often seen on
rough diamond. These can usually be seen with a 10x
prospectors hand lens (loope).