614 



Report of the State Geologist. 



The ore runs higher in phosphorus and sulphur than any of the others 

 yet analyzed. Mr. 'Rossi has also noted in his experiments, indications of the 

 presence of vanadium, which has been recognized both in Scandinavia and in 

 New Jersey as one of the characteristic ingredients of titaniferous ores. The 

 high alumina in the second analysis, much above any aluminous silicate that 

 might be present, is worthy of note, and the same is true of the lime. Some at 

 least of the magnesia is combined with iron oxide and silica to yield hyper- 

 sthene ; some perhaps with lime and alumina for augite. Some of the lime 

 may be united with silica and titanic oxide to give titanite and some with 

 alumina and silica to form labradorite; but in whatever way the combinations 

 are worked out, there remains an excess of alumina and lime, so that the 

 probability of spinel being present is heightened. 



Professor Emmons mentions other ore-bodies whose presence was demon- 

 strated in his time, viz., a vein of " fine-grained " ore about eighty rods east of 

 the works. It would be on the map at or near the southern prolongation of 

 the "Black Ore" belt, but as he states (page 254) that it was 150 feet across 

 and 5,742 feet long, it must be distinct from this vein as mapped. He also 

 cites much float-ore along East river (now called Calamity brook). Since his 

 time float-ore has also been located to the northwest toward the Preston 

 ponds. The magnetic surveys of Mr. Sebenius have indicated strong attrac- 

 tion under the lake and on its shores south of the Sanford belt, and still 

 additional localities of attraction have been met near the Lower Works (now 

 called Tahawus post office) in the gneissoid rocks of that section. In fact, 

 the more one collates the accumulated data, the more one shares in Professor 

 Emmons's impression of the large amount of ore that is present. 



For the ore-bodies in the massive anorthosites, the only conception that 

 fits their mineralogic character and geologic associations is that they are 

 great bodies of titaniferous iron oxides, segregated from a vast plutonic magma, 

 through whose crystallized substance they are now distributed in broad and 

 somewhat roughly outlined belts. All gradations can be found from pure 

 metallic oxides to pure masses of labradorite. 



As regards their future development, if brought about, it will be by 

 means of an extension of the Adirondack railroad up the valley of the 

 Hudson, along the route that can be easily traced on the maps of Minerva 

 and Newcomb. The grades are gentle and the engineering difficulties are 

 slight. 



