98 NEW YORK STATE MUSEUM 



In a description of this mine Newland 1 says: "The deposit' has 

 a northwesterly strike in conformity to 'the general trend of the 

 country rocks. It has a flat dip of not more than 10 northeast, 

 but as the surface rises sharply in that direction, the overburden 

 soon becomes too 'heavy for open-cut work. There are a number 

 of pits and trenches along the outcrop, extending altogether for a 

 distance of 100 rods. A breast of ore 12 or 15 feet thick is exposed 

 in the middle section. The thickness diminishes toward the ends, 

 but it was not possible to estimate the size with accuracy owing 

 to the partial filling in of the pits. Some drilling is said to have 

 been done a number of years ago to test the ore body in depth ; 

 the records, however, have not been available for use in this 

 report." 



" The ore is a fairly coarse, granular magnetite. Samples taken 

 from different parts of the body indicate an iron content above 

 50 per cent on the average, so that it would be classed as of rich 

 grade. The principal impurity is pyrite which seems to be concen- 

 trated in narrow bands and is not generally admixed with the 

 magnetite. A quantity of the more sulfurous ore has been left 

 on the surface near the openings." 



As far as could be determined in the old pits, now considerably 

 filled with water, the ore appears to be a crude, lenslike mass 

 directly associated with an intimate mixture of granite and older 

 dark gneisses. The granite is gray to pinkish gray with well- 

 developed foliation, being locally almost schistose. The older 

 rocks are chiefly hornblende and hornblende-biotite gneisses with 

 some garnet and pyrite, and dark green pyroxene gneiss. In this 

 connection it may be noted that similar ore has been described by the 

 writer as occurring in like association with closely involved syenite 

 or granite and dark gneisses in both the Port Leyden and 

 Remsen quadrangles, and by Gushing in the Little Falls quadrangle, 

 all of these along the southwestern border of the Adirondacks. It 

 would seem that when the syenite or granite magma worked its way 

 through or alongside the dark gneisses, the conditions were somehow 

 favorable for the segregation of the magnetite. 



Prospect near Loch Muller. In and about a small prospect 

 opening three-fourths of a mile northwest of Loch Muller, mag- 

 netic iron ore also occurs in direct association with intimately mixed 



1 N. Y. State Mus. Bui. 119, p. 89-90. 1908. 



