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THOMPSON 8 COAST PILOT: : 1338 mens being highly prized. Off this harbor the lamented Dr. Hough- ton was drowned, October, 1845, while engaged in exploring this section of country ; Keweenaw Point and adjacent country being very appropriately named Houghton County in honor of his memory. | On the north side of Keweenaw Point bold shores extend to near Ontonagon, with high lands in the 'distance, forming the rich copper range of this region. ONTONAGON, Ontonagon County, Michigan, 336 miles from the Sault Ste. Marie, is advantageously situated at the mouth of the river of the same name, The river is about two hundred feet wide at its mouth, with a sufficient depth of water over the bar for large steam- ers, Here is being erected extensive piers. The village contains an Episcopal, a Presbyterian, and a Roman Catholic church ; two good hotels, the Bigelow House and Johnson House; two steam saw mills, and ten or twelve stores. and storehouses, and about 1,200 in- habitants. | 's In this vicinity are located. the Minnesota, the National, the Rockland, and several other very productive copper mines. The ore is found from twelve to fifteen miles from the landing, being imbed- ded in a range of high hills traversing Keweenaw Point from NE to SW for about 100 miles. Silver is here found in small quanti- ties, beautifully intermixed with the copper ore, which abounds in 'great masses. . A good plank road runs from Ontonagon to near the Adventure mine, and other mines, some twelve or fourteen miles distant, where commences the copper range of hills. A small steamer also runs on Ontonagon River to near the Minnesota and National Mines, where is a flourishing settlement, inhabited by miners. ST. MARY'S RIVER. By a careful examination of the Government charts of the Straits of Mackinac and River Ste. Marie, published in 1857, it appears that the Point Detour Lighthouse is situated in 45° 57' N Lat., being 36 miles to the eastward of Fort Mackinac. 'The width