Yates and Stephen Birch are preparing expedition to the Copper River country; backed by large financial interests; having a churn drill made which can prospect 10 acres of frozen ground in a week, Portland Oregonian, 4/6/98; Filed in VMDR, , 1898-1899, p. 162; Files claim with Abercrombie on Eagle River, 1899. PWSMDR, , Bk. 2, 1898-1900. p. 146; Filed: George Hogg, S. Birch, J.P. Roberts near Swanport in VMDR, p. 161, 10/23/1899;