History & Geology
ICMJ Visits Grass Valley, California
March 2023
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The Many Facets of Iron
March 2013
I’ve been fascinated by iron minerals for many years. So let’s take a look at this very interesting and colorful element.
I’ve been fascinated by iron minerals for many years. So let’s take a look at this very interesting and colorful element.
The Birimian Greenstone Belts of West Africa
July 2013
The country we were to visit was Burkina Faso, a small country about the same size of my home state of Nevada with about 10 times more people. The second day I was in Africa, we went out to the goldfields for the first time.
The country we were to visit was Burkina Faso, a small country about the same size of my home state of Nevada with about 10 times more people. The second day I was in Africa, we went out to the goldfields for the first time.
Conrey Dredge No. 4
November 2017
The large buckets were favorable for the type of ground worked. The gravel was tenacious and compact, due to the existence of irregular pockets of clay.
Confluence Placers
June 2013
Confluences of placer streams are well known as concentration sites for heavy minerals. The basic reason is that...
Confluences of placer streams are well known as concentration sites for heavy minerals. The basic reason is that...
Gold in Tertiary Gravels
November 2015
In some places, semi-continuous sections of riverbed can easily be linked in many places to identify the path of the ancient rivers.
In some places, semi-continuous sections of riverbed can easily be linked in many places to identify the path of the ancient rivers.
Gold in the San Francisco District Oatman, Mohave County, Arizona
December 2013
I suspect detailed geological mapping and prospecting would lead to discovery of one or more overlooked gold deposits in the district even though it has been heavily prospected in the past.
I suspect detailed geological mapping and prospecting would lead to discovery of one or more overlooked gold deposits in the district even though it has been heavily prospected in the past.
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