ADIRONDACK MAGNETIC IRON ORES IO3 



10 to 12 feet wide, with an extreme depth of ioo feet. In its associa- 

 tion and nature the ore is much the same as the Palmer hill ore and 

 it is said to have yielded equally good iron. 



Dills & Lavake and Rutgers pits. The openings are situated 3 

 miles north of Palmer hill at an elevation of about 1400 feet, as 

 nearly as can be determined. They are just without the limits of 

 the Ausable topographic sheet. The Dills & Lavake is an open cut 

 100 feet long and 15 feet wide. The Rutgers pit north of this is 

 nearly circular, 30 feet in diameter and about that in depth. The 

 ore is somewhat richer than the average for Palmer hill. It con- 

 tains apatite in plainly visible grains, indicating a high phosphorus 

 content. The following incomplete analyses have been furnished 

 by Mr J. N. Stower. No. 1 refers to a sample of ore from the Dills 

 & Lavake pit and No. 2 to a sample from the Rutgers : 



1 2 



Iron 50.60 50.10 



Sulfur . 003 .022 



Phosphorus .64 . 341 



Titanium .- ' .45 .45 



Cook mine. On the ridge east of Arnold hill the gneiss series is 

 well exposed. Much of it is the reddish microperthitic nearly mas- 

 sive variety that has been described as the predominant formation 

 of the district, but there is less augite and oftentimes very little 

 quartz present. In the vicinity of the Cook mine the dark constitu- 

 ent is biotite and the rock has the composition of syenite. A coarse 

 quartzose hornblende variety, which looks like a sheared granite, 

 is found in small patches that may represent later intrusions; it 

 has a fresher appearance than the syenite and the borders are com- 

 monly pegmatitic. 



The Cook mine, mentioned by Emmons as having been exploited 

 several years before the date of his report, supplied ore to forges 

 on the Little Ausable. It was last worked in 1856 when the forges 

 were carried away by a flood. Two pits evidence these early opera- 

 tions. They are situated on the western side of the ridge nearly 

 opposite the Nelson Bush shafts on Arnold hill. The elevation is 

 about 1000 feet. Both are surface strippings, of which the larger 

 exposes a breast of ore about 1 2 feet from wall to wall. They have 

 a north strike and a dip 8o° west. The smaller parallel pit lies above 

 separated by 30 feet of rock. Emmons records that in exploring 

 the^deposit by a transverse trench four veins were encountered 

 with thicknesses of 2 feet, 3 feet, 6 feet and 13 feet respectively. 



