text: Kennecott had five mines: Bonanza, Jumbo, Mother Lode, Erie and Glacier.  Glacier, which is really an ore extension of the Bonanza, was an open-pit mine and was only mined during the summer.  Bonanza and Jumbo were on Bonanza Ridge about  from Kennecott.  The Mother Lode mine was located on the east side of the ridge from Kennecott.  The Bonanza, Jumbo, Mother Lode and Erie mines were connected by tunnels.  The Erie mine was perched on the northwest end of Bonanza Ridge overlooking Root Glacier about  up a glacial trail from Kennecott.  Ore was hoisted to Kennecott via the trams which head-ended at Bonanza and Jumbo. From Kennecott the ore was hauled mostly in 140-pound sacks on steel flat cars to Cordova, 196 rail miles away, via the Copper River and Northwestern Railway (CRNW).
  In 1911 the first shipment of ore by train transpired.  Before completion, the steamship Chittyna carried ore to the Abercrombie landing by Miles Glacier.  Initial ore shipments contained "72 percent copper and 18 oz. of silver per ton."
  In 1916, the peak year for production, the mines produced copper ore valued at $32.4 million.
  In 1925 a Kennecott geologist predicted that the end of the high-grade ore bodies was in sight. The highest grades of  ore were largely depleted by the early 1930s. The Glacier Mine closed in 1929. The Mother Lode was next, closing at the end of July 1938. The final three, Erie, Jumbo and Bonanza, closed that September.  The last train left Kennecott on November 10, 1938, leaving it a ghost town.
  From 1909 until 1938, except when it closed temporarily in 1932, Kennecott mines "produced over 4.6 million tons of ore that contained 1.183 billion pounds of copper mainly from three ore bodies: Bonanza, Jumbo and Mother Lode."  The Kennecott operations reported gross revenues above $200 million and a net profit greater than $100 million.