RI 4226 Investigation of Coker and Bickford Zinc Deposits, Iowa County, Wis.

"INTRODUCTION In the course of a general investigation of mines and mineral deposits in the Upper Mississippi lead and zinc field, attention of the Bureau of Mines was first directed to the Coker mines area by the presence of large tonnages of old mill tailings containing economically recoverable percentages of lead and zinc. Later, the results of extensive geologic studies of the area were presented to the Bureau of Mines by the Federal Geological Survey, directing attention to the possibility of extending the known ore limits of the area to the north and northeast of the old Coker No. 1 mine workings.With this end in view, the Bureau of Mines undertook a program of churn drilling and sampling. This report describes the work done and presents the data obtained during the period of the Bureau of Mines investigation.ACKNOWLEDGMENTSIn its program of investigation of mineral deposits, the Bureau of Mines has as its primary objective the more effective utilization of our mineral resources to the end that they make the greatest possible contribution to national security and economy. The Mining. Division, Lowell B. Moon, chief, conducts preliminary examinations, does the actual investigative work, and prepares the final report. The Metallurgical Division, O. C. Ralston, chief, analyzes the samples and makes beneficiation tests."