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6997 151 (1915-1916)

handle is hein.usccsset/usconset38570 and id is 1 raw text is: A RECONNAISSANCE IN THE KOFA MOUNTAINS, ARIZONA. By EDWARD L. JONES, Jr. INTRODUCTION. LOCATION. The isolated mountainous area here designated the Kofa Moun- tains lies in the central part of Yuma County, Ariz. These moun- tains cover an area of approximately 200 square miles and are sur- rounded by broad, gently aggraded plains that separate them from other detached mountains, of which the Plomosa and Chocolate mountains and the Castle Dome Range are the nearest. The Kofa mining district, from which the mountains derive their name, is in the southern part of the range. HISTORY. Although southwestern Arizona had been prospected for many years, particularly in the early sixties, when the La Paz placers, 40 miles northwest of the Kofa Mountains, were actively worked, this area received little attention until the discovery of the King of Arizona ore body in 1896. The King of Arizona mine produced ore con- tinuously from the date of its opening to the summer of 1910, when the ore became of too low grade for profitable treatment. -The mine produced gold and silver bullion to the amount of $3,500,000, gold greatly predominating in value. The surface ore of the mine was extremely rich, much of it being worth $1 a pound. Ore of this grade was packed or hauled to Mohawk, on Gila River, and there treated in a small cyanide mill: In 1899 a 225-ton mill was built at the mine and was operated until the mine closed. In 1906 the North Star ore body, 1j miles north of the King of Arizona, was discovered by Felix Mayhew and sold shortly afterward to the Golden Star Mining Co. for $350,000. Development was soon started, and by 1908 this company had erected a cyanide mill which it operated until August, 1911, when the ore became of too low grade to work. The mine produced, according to statistics published by this Survey in Mineral Resources of the United States, approxi- mately $1,100,000 in gold and silver. The deserted camp of Kofa centers around the King of Arizona mine, and the settlement of 151