Drilling for placer gold.
Publisher: Keystone Driller Co.
Place of publication: Beaver Falls, Pennsylvania
Language: eng
Number of pages: 195
Subjects: Hydraulic mining.; Gold mines and mining.
Table of contents: value: Part I.Prospecting for placer gold with the Keystone drill.; value: Part II. Authoritative articles on mineral prospecting.; value: Part III. Mineral prospecting machinery.