26.17 



Calcite 



•31 



Magnesite 



i.o8 



Siderite 



21.49 



Kaolinite 



9-75 



Limonite 



.65 



Quartz 



37.02 





3-53 





100.00 





46.66 



.65 



1-74 



24.69 



• 74 



25-52 



22 NEW YORK STATE MUSEUM 



pounds, we can recast the analysis and obtain an original limestone 

 of the following composition : 



CaO 



MgO 



FeO 



CO. 



AUOs 



FesOa 



SiO^ 



H2O 3.53 100.00 



The above composition is not an impossible one for an earthy 

 rather siliceous limestone. Such a one might have existed and have 

 become recrystallized with no contributions of matter from the 

 igneous rock. It is by no means certain, however, that silica was 

 not introduced. 



The third analysis with its large proportion of andradite resem- 

 bles the usual run of garnets from contact zones. The composition 

 can not well be explained without assuming the introduction of iron 

 oxide and silica from the igneous mass. 



The contacts at the Weston mines. The most important of the 

 contact effects are found to the west of the main valley of the 

 Ausable river and reach their maximum one-half of a mile up a 

 tributary stream which enters the Ausable from the northwest very 

 near the edge of the sheet. The bodies of magnetite, which the 

 contact zones contain, attracted attention as early as 1847. During 

 the great period of activity of the bloomaries throughout the next 

 30 or 40 years when every water-power had its forge, its blowing 

 engine, and trip hammer, mining operations were carried on to such 

 a degree as to leave rather large excavations in two places, a num- 

 ber of exploring pits in others, and dumps which give a good idea 

 of the geological relations. The mining ceased in 1880 and the 

 buildings have all fallen in ruin since. The best of the early records 

 is that left by Bayard T. Putnam in volume 15 of the Tenth Census 

 Reports, page 118. His words may be advantageously quoted in 

 their entirety. 



The Hale mine is located at Long Pond mountain, about i mile southwest 

 of the village of Keene. Keene township. It is worked by VV. F. and 

 S. H. Weston. The ore lies in white crystalline limestone. The first open- 

 ing made in the vicinity is on the V/ood farm, which adjoins the Hale farm 

 on the west. The Wood mine was opened by the Westons in 1872, and 

 was abandoned in December 1880. It produced 1120 tons of ore in the 

 census year. The ore formed a shoot 8-16 feet wide, which dipped at a high 

 angle to the northwest and pitched to the northeast at an average angle of 



