I08 NEW YORK STATE MUSEUM 



having an outcrop length of looo feet and affording breasts of ore 

 30 feet high in places. The deposits exhibit rolls, swells and pinches 

 and remind one very much of the involved structures found in 

 the Mineville occurrences. Mining operations were complicated by 

 these features and by the distribution of the ores among so many 

 separate bodies which are distributed over about a square mile. The 

 property was under examination by the Oliver Mining Co. in 1906, 

 which located some unmined bodies with the diamond drill. The 

 magnetites as mined contain from 50 to over 60 per cent iron, with 

 quartz as the principal gangue, are free of sulphur and hold a few 

 hundredths of a per cent of phosphorus. 



In the vicinity of Hammondville, on separately owned properties, 

 are the Skiff, Long pond, Schofield and Paradox lake mines of 

 smaller size. 



On Reed mountain near Crown Point village and southwest of 

 there pyritic magnetite occurs in several places. 



Mineville. The most productive deposits of the Adirondacks 

 are at Mineville; the output of the two companies, which have 

 operated the mines from the start — Witherbee, Sherman & Co. 

 and the Port Henry Iron Ore Co. — exceeds 1,000,000 tons in active 

 years, the largest for any iron ore district in the east. The main 

 resources for a long time was the 21 -Joker-Bonanza group 

 of mines based on a single great " horn " of ore, 2000 feet or so 

 in length, composed of an enveloping body of magnetite about a 

 core of the country gneiss, the whole laterally compressed and parts 

 drawn out into wedgelike extrusions so as to afford a constantly 

 changing section. The outlines of the body as first surmised from 

 the features revealed by development and test drilling have been 

 considerably modified with the progress of exploration and mining 

 which now have established practically the full contours. The main 

 ore supply has been nearly worked out, in fact practically only 

 the pillars are left, which of themselves represent a large tonnage 

 that awaits possible recovery. A separate and extensive ore body 

 was found to lie below the Joker-Bonanza deposit taking the form 

 of a slightly inclined tabular mass which pitches to the south with 

 the other and yields a similar high-phosphorus magnetite. This 

 body has been exploited by sinking in the Joker-Bonanza work- 

 ings. It reaches to the south beyond the limits of the latter de- 

 posit. 



