skip to content
Search
Search U.S. government technical reports digitized or harvested by
TRAIL
.
Keyword Search
Enter your search term(s):
[advanced search]
3 results returned
Browse TRAIL Inventories
(opens in new tab)
Search results
Recovery of gold from black sand by classifier concentration
Comparison of methods of gold recovery from black sand
Methane in California gold mines
Refine your search results
Published Year
1920-1929 (3) *
Subject
Gold mines and mining (3) *
Firedamp (1)
Gas bursts (1)
Gold mines and mining--California (1)
Methane (1)
Mine gases (1)
Mine gases--Flammability (1)
Mine gases--Measurement (1)
Mine ventilation (1)
Author
Gross, John, (2)
Davis, John A. (1)
Gardner, E. D. (1)
Pickard, Byron O., (1)
