I placed photos in an album "Cedar Mountain" about some rare diamondiferous pipes & dike in the Green River Basin. The photos show indicator minerals, characteristic breccia & rounded boulders in pipes as well as a dike. These are difficult to recognize because the pipes and the country rock have similar color & clays. Whenkimberlites were first found in South Africa, they were thought to be dry placers because of all of the rounded boulders (something that these pipes tend to do - round bounders by partial assimilation in the magma during eruption). Essentially all of the kimberlites & diamondiferous lamprophyres show rounded boulders and cobbles - which I will discuss in my upcoming newsletter - (http://gemhunter.webs.com/newsletter.htm).

At one time, I was shown a unusual rounded gneiss & gabbro cobbles in Tertiary rocks south of Little America - might be another pipe?

Diamonds were recovered from the Cedar Mtn breccia pipes by 3 different companies. We came across a family who had one large diamond in their collection & indicated that a group of diamonds (2 to 5 carats) were found in this area. Other diamonds were recently found in Butcherknife Draw to the northeast of the pipes. The indicator minerals were found in the pipes, stream sediments & in the Bishop Conglomerate in Wyoming, Colorado and Utah. In Colorado, these same indicator minerals were reported in the Bishop Conglomerate on top of Diamond Peak (site of the Great Diamond Hoax - another story).
Dan

1  out of 1 found this valuable. Do you find this valuable? Do you?