32 NEW YORK STATE MUSEUM 



ported by the individual producers was valued in 1906 at $37,118,430, 

 the valuation being based on the crude or first marketable form of 

 the products. The corresponding total for 1905 was $35,470,987 

 and for 1904 it was $28,812,595. The varied character of the in- 

 dustries is shown by the fact that there are some 35 different ma- 

 terials produced in commercial quantities. Among the more notable 

 developments recorded in the last report are those relating to the 

 iron ore, gypsum and salt industries, all of which have possibilities 

 for expansion greatly beyond present proportions. 



These mineral statistics are gathered and tabulated with ultimate 

 care. It is believed that they present the most accurate analysis 

 given to the public of the condition of mineral production in this 

 State. They are published with promptitude and as early as pos- 

 sible after the close of the calendar year. 



Iron ores. The description of' the iron ore resources of the 

 State has been an urgent need for some time. The previous reports 

 of Emmons, Putnam and Smock are out of print and besides are 

 wanting in many particulars to make them representative of present 

 conditions in the technical and scientific branches of the subject. 

 Field work preliminary to a new investigation was started in 1905 

 by the Assistant State Geologist and has been continued as oppor- 

 tunity offered dtiring subsequent seasons. Owing to the size of 

 the territory that has to be covered by field work it has been deemed 

 advisable to issue a separate report on each of the larger districts, 

 whereby an earlier publication of the results will be assured. The 

 Adirondack magnetites will be described in the first report, the 

 preparation of which is now practically completed. In this part of 

 the work the cooperation of Prof. J. F. Kemp has been secured. 

 He has kindly undertaken to prepare a description of the Mine- 

 ville district which he has recently mapped in connection with -the 

 survey of the- Adirondacks now being carried out under the direc- 

 tion of the State Geologist. 



The investigation of the Adirondack magnetites has brought out 

 much that is new concerning their geology. The important prob- 

 lems bearing upon the character of the rock associates and origin j 

 of the so called nontitaniferous magnetites have been studied with . 

 care, and while they are extremely puzzling, it is believed that 

 progress has been made in their elucidation. The walls inclosing 

 this class of ores belong to the feldspathic gneiss series which it 

 has been found includes both igneous and sedimentary derivatives. 

 There may be distinguished, thus, two main varieties under which 

 all of the occurrences probably are Included, though In a few cases 



