Back in the summer of 2011, while on a camping trip in Northern Washington state, I took a quick hike to the Tenderfoot Mine and Mill. The mine predates 1932 when it was re-recorded as the Gold Crown Mine by E.B. Bales and George Letson. In 1951, possibly the time period the mill was (re)built, owners Vic Byrski, Vern Anderson, and Perry Luce claimed that ore values were assayed at $12 to $93 per ton.
Woodhouse, Philip R., Daryl Jacobson, and Victor Pisoni. Discovering Washington’s Historic Mines. Vol. 4. Monroe, WA: Northwest Mining, 2011.
Huntting, Marshall T., Inventory of Washington minerals; Part II—Metallic minerals: Washington Division of Mines and Geology Bulletin 37, Part II, 1956.
Rinehart, C. D., and Fox, K. F., Jr., Geology and Mineral Deposits of the Loomis Quadrangle, Okanogan County, Washington: Washington Division of Mines and Geology Bulletin No. 64, 1972.