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Info Last updated: 02.07.2022 (09:25:44)
Id No. (Mine / 1902 map):
Date Located / Formed:
Location Map Description:
Discovery / Formed by:
- Portland Gold Mining Company ()
Closed July 30, 1918; due to small profit even with good extraction.
- Portland Gold Mining Company
Location Claim Description:
Mineral Certificate No.:
General Land Office No.:
Known Transportation Connection:
Extra Info/Details [Linked at One Time to the Entity]:
Known Producing Info:
||treated 13,100 tons, at an unknown value per ton.
The Portland company introduced fine grinding in cyanide solution, without roasting; agitation; and zincdust precipitation in its Victor mill, built at the mine in 1910. The Victor mill began operations in June 1910, and was closed in 1918.