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U. S. Bureau of Mines Open-File Report MLA 65-83
llamabox
post Sep 16 2013, 09:06 AM
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Doing research I have seen this study referenced many times but I can't seem to find it or a way to request a copy of it. I have found some of the accompanying work that has come in helpful, but if anyone can help me find this one I would be very thankful.

U. S. Bureau of Mines Open-File Report MLA 65-83
Mineral investigation of the Sangre de Cristo Wilderness Study Area, Alamosa, Custer, Fremont, Huerfano, and Saguache Counties, Colorado:Ellis, C.E., Hannigan, B.J., and Thompson, J.R., 1983
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swizz
post Sep 16 2013, 05:32 PM
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I tried but couldn't find anything on it.
What info are you trying to get from the report?


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llamabox
post Sep 16 2013, 09:19 PM
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Just trying to get more info. Not sure what exactly is in the report. It has been cited in a number of places while doing research on old/closed claims. Such as this one,
QUOTE
Sampling by Ellis and others (1983) produced grades up to 0.58 oz/ton gold, 2.8 oz/ton silver, and 2% copper from iron- and copper-stained gneissic fault gouge, silicified fault breccia, and quartz veins.

Is that quote for that claim exactly or for the general area. Did the Bureau of Mines do sampling from each of the past producers in the area?
I was able to find this one done the next year.
Mineral resource potential map of the Sangre de Cristo Wilderness study area, south-central Colorado
1984, Johnson, B. R.; Lindsey, D. A.; Ellis, C. E.; Hannigan, B. J.; Thompson, J. R.
USGS Miscellaneous Field Studies Map: 1635-A http://pubs.usgs.gov/mf/1984/1635a/report.pdf
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Caveman
post Sep 17 2013, 07:22 AM
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That would be for that specific claim, I think - I have run into that type of info too, while trying to look it up - specifically for the claims out near the Great Sand Dunes. It seems that they went to a lot of the old major and minor claims and did some sort of investigation of them and their geology, with a little investigation of the general areas, but the specific info (x.xx gold per ton) looks like it is from the assays from the original claim(s), not the general areas. Still, it gives you a start for an area to look.


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