The Coeur d'Alene Mountains, River and Lake are in Idaho Territory, near the line of Washington Territory. The drainage is through Spokane River into the Columbia. The distance from the nearest point on the lake to Spokane Falls is twenty-five miles. The Coeur d'Alene River has two branches, on both of which mining has been done, but most largely on the South Fork. Previous to 1886, all the mining on this fork was done at Eagle, Beaver, Delta, Murray, etc., and was chiefly gold placer mining, which was not particularly remunerative. Placer mining has also been done on the South Fork; but the chief ores on this branch are argentiferous galena, with some gold in quartz. A large number of claims have been worked into since the beginning in 1885, and the increase of mining population has been going on rapidly. Mr. Glidden thought that there were ten thousand people last fall in the Coeur d'Alene mining country. The veins are accessible and very thick, some of them as much as forty feet. The ores usually carry 40 to 60 per cent. of lead, 5 to 50 ounces of silver, and often about $3.00 in gold to the ton of ore. The veins are true fissures, and strike across the country rocks, which are principally porphyry and quartzite. The strike of the main veins runs parallel to the river, and at a distance of two to six miles from it. There are many cross gulches which cut the veins at right angles, and thus present vertical faces which offer the best facilities for prospecting and for mining. The veins have been opened at so many places as to put beyond doubt their continuity on long lines, and their great abundance. In fact, the indications point to a development resembling that made near Leadville. [Sidenote: The large tonnage from and to the mines.]