. Report of the National conservation commission. February, 1909. C. Covert, F. F. Henshaw,P. S. Smith, F. H. Moffit, and Adolph Knopf. In the lack of comprehensive quantitative data it will probably bestserve the purposes of this report to consider the more general prob-lems of geographic and geologic occurrence of the various usefulminerals of the Territory. The coal resources will be considered atsome length, both because of the importance of the mineral fuelreserves and because the geologic occurrence of coal is such as topermit a quantitative interpretation of the data with a far greaterd
. Report of the National conservation commission. February, 1909. C. Covert, F. F. Henshaw,P. S. Smith, F. H. Moffit, and Adolph Knopf. In the lack of comprehensive quantitative data it will probably bestserve the purposes of this report to consider the more general prob-lems of geographic and geologic occurrence of the various usefulminerals of the Territory. The coal resources will be considered atsome length, both because of the importance of the mineral fuelreserves and because the geologic occurrence of coal is such as topermit a quantitative interpretation of the data with a far greaterdegree of assurance than of those relating to other mineral subject of iron ore reserves, of almost equal importance with thatof coal, can be but briefly touched upon, because so few facts regard-ing it are available. But little attention has been devoted to iron ore572 1 n % \ C toorac Z JS ^ ^ 8 CO -J ■OD o E 3 f _| fO g Q Areas know Anthracitebituminous, Bituminou il Z c o UJ J c a 1 S B 0) l| Q- in p c (0 ■;i-?-V W * a 73 >* B c + X) c 1. BE00K3.] ALASKA. 573 by the Alaskan geologists, for there is not a single iron mine in theTerritory and at only two localities have iron-ore bodies been pros-pected. Relatively much more is known about the auriferous de-posits, especially the placers, for here the observation of the geologistis supplemented by the many facts developed in the course of miningand prospecting. But the character of these deposits, especially thatof the auriferous lodes, makes estimates of mineral reserves of butlittle value. The same holds true of the copper deposits, which are oftoo great irregularity to allow even an approximation of the avail-able tonnage. Moreover, though copper ores find a wide distributionin the Territory, they have been mined in only two districts. Mostof the copper mines are not over 200 feet in depth, one only havingreached 600 feet. Predictions as to permanency of ore bodies at depthin this field, which must form a
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