This is a large island containing over a thousand square miles, almost surrounded by Behm Canal. On upper Thorn Arm, about thirty miles southeast of Ketchikan, quite extensive gold quartz mine developments have been made, by drifting, cross cutting, damming and piping of water, etc. A small stamp mill was erected here in 1902. A little farther down the Arm are extensive quantities of uniform garnets, some of which the tourists carry away on every boat.

George Inlet, a little nearer Ketchikan, has a few gold prospects, and Tongass Narrows, still nearer, has about the same. In the vicinity of the gold prospects and mines some good marble has been located, but not worked.

The Unuk River, on which gold was discovered in 1870, empties into the head of Behm Canal. It is of considerable size, short and very rapid, and for the most part lying in Canadian territory. A wagon road has been built on its banks for the purpose of developing mines. In the times of gold excitement in Cassair, Atlin and Klondike districts, prospectors found their way in along this stream to the headwaters of the Iskut River over a low divide, as they also did by the way of the Stikeen, Skeena and Taku. There are several hot and cold mineral springs in this vicinity.

Cleveland Peninsula, a large, mountainous, timber-covered spur lying on the north side of Behm Canal and south side of Ernst Sound, and east side of Clarence Strait, has many gold quartz prospects, but only one extensive improvement, which is on the Gold Standard Group, at Helm Bay, where a five-stamp waterpower mill has been installed, and considerable gold obtained. A vein from six inches to six feet in width and a thousand feet long is exposed. Duke Island and Annett Island, to the south of Ketchikan, have no mineral developments, although James Bawden reported profitable gold on Annett Island in 1892. Mr. Duncan has been opposed to miners prospecting on the island, because they endanger the missionary work he is doing there. On the west side of Tongass Narrows, opposite Ketchikan, is Gravina Island, of considerable size, but of little mineral importance, although some gold and copper prospects have been found at Valenor Bay on the north, and Dall Head and Seal Cove on the south end. The narrow channel and rugged scenery known as Tongass Narrows is picturesque in the extreme. Excepting those about the canneries, the natives are poor and few.

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