Photocopies of a printed map and a handwritten and signed letter (7 pages). The map also displays an "Outline of the Delamar Mining District" of Nevada which is a brief history of mining in the area. Wilkinson's letter is not dated but was addressed to John M. Townley of Las Vegas, Nevada. Wilkinson writes about the Jumbo Claim of the Delamar Mining Company located south of Pioche, Nevada. He tells about the use of cyanide and mercury in processing ore.