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Alaska Northern Railway Anchor Point arsenopyrite assay bedrock beds bench bluff bowlders calcite chalcopyrite chert Clay shale cliffs Coal coast conglomerate consist Cook Inlet Cooper Creek country rock Crow Creek deposits dike district east shore ellipsoidal exposures Falls Creek fault feet thick fine-grained folded fossils galena geologic glacial glaciers granite gravels gray graywacke and slate greenstone Gulch inches interbedded Island Kachemak Bay Kenai formation Kenai Lake Kenai Mountains Kenai Peninsula Kenai River lavas limestone lode Lower Jurassic miles mill mineral Mining mouth Nuka occur outcrop places Port Graham Prince William Sound probably prospects pyrite quartz veins Quaternary region reported Resurrection Bay Resurrection Creek Sandstone schist Seldovia Seldovia Bay Seward shale shore of Cook shore of Kachemak slate and graywacke sphalerite stream strike sulphides Sunrise group Survey Bull Tertiary tuffs tunnel Turnagain Arm U. S. Geol Upper Triassic valley width zone
Page 90 - Draw a diagonal line from the upper left corner to the lower right corner of the chart as shown at the right . a.
Page 20 - It covered an area of 1GO square miles, for- publication on a scale of 1 : 62,500, with 50-foot contours. A geologic reconnaissance of this area has already been made by AH Brooks. (See p. 75.) Kenai Peninsula. — RH Sargent carried a topographic reconnaissance survey from Kachemak Bay northward to Turnagain Arm. The work included the revision and original mapping of part of the Sunrise placer district, and later the survey of the drainage basin of Resurrection River, near Seward. In all, an area...
Page 202 - ... south, at the rate of about one foot in 10 feet. A slight western inclination was also present. The coal is overlain by a thin-bedded sandstone or sandy shale 3 or 4 feet thick. The dark shale bed containing concretionary limestone masses covered with cone-incone structure and pisolite is also exposed about a quarter of a mile above the mouth of the creek that joins the river in the NW.
Page 98 - Chlorite is sparingly present throughout the rock, but thebisilicate from which it was derived could not be determined. The dikes are quite coarsely porphyritic near their centers, but toward the contact with the cherts become almost aphanitic. The cherts are whitened for a few Inches from the contact, but not otherwise altered.
Page 106 - The prospect of furnishing the company's steamers with coal obtained in the colonies, and of selling the surplus at high prices in San Francisco and elsewhere, acted as a powerful incentive. In 1857 shafts had been sunk and a drift run into the vein for a distance of nearly 1,700 feet, nearly all of which was in coal. During this and the three following years, over 2,700 tons were mined, the value of which was estimated at nearly 40,000 roubles, but the result was a net loss.
Page 188 - ... are taken to impound at least the coarse material. This ground has been well prospected by holes and a few crosscuts, so that the management feels justified in incurring the great expense which was necessary to open the ground. The working season is several weeks shorter here than at the lower end of the stream, since the claims are above timber line and are entirely unprotected from the cold winds of the valley.
Page 107 - Homer, under the supervision of MB Curtis. Three buildings and a short pier were erected at the mouth of the canyon, and a tramway was constructed from the pier to a tunnel driven on a coal seam half a mile up the canyon. The buildings are still standing, but the tramway, which follows the east bank of the creek, is undermined in many places. At least 650 tons of coal were taken out, lightered to the steamer Theobald, which lay at anchor in Bear Cove, and sent to San Francisco to be tested. This...
Page 199 - Canyon ('reek shows at the top from ti to 8 feet of soil and coarse wash overlying 8 feet of sandy deposits, followed in turn by stratified clays and gravel. The high gravels away from the channel have not been prospected, although gold is present in the high banks on the left side of Canyon Creek near "the forks," and the writer was told that a hole somewhere west of the stream showed good prospects.
Page 109 - Prospecting on the small streams emptying into the eastern end of Tustumena Lake has shown the presence of gravels carrying gold in small amount. Some attempts have been made to exploit them, and for a number of years there has been a little mining on Indian Creek. A hydraulic plant was taken in by way of Kasilof River, and has been in operation, but the results of the work were not learned. It is known, however, that work will be continued. Access to the lake by way of the river is not difficult...
Page 202 - ... in the way of placer mining is now done on the creek. The gold is heavy and contains numerous pieces of native copper whose probable source is the ledge now being opened up at the head of the creek. All work on Lynx Creek has been done with pick and shovel. Owing to the low grade of the lower part of the stream the gravels there have not been exploited. To overcome this difficulty a tunnel about 500 feet long and In-low the level of the water at its head is being driven to divert the stream.