THE MIXING AXD QUARRY INDUSTRY I907 I3 



The ore occurrence was described briefly in the preceding issue 

 of this report. It consists of arsenopyrite and subordinate 

 pyrite with a quartz gangue occurring in veins that cut the 

 gneiss country rock in proximity to a basic dike now ahered to 

 serpentine. The veins are made up of a number of parallel 

 stringers closely set and forming what is properly called a lode. 

 There are two such lodes of which the one worked has a north- 

 erly strike and is from 12 to 20 feet wide while the second lode 

 intersecting at an angle of 60^ has been only prospected. The 

 ore body is opened by a vertical shaft bottomed at 100 feet from 

 which a drift has been run along the course of the lode. It is 

 about 12 feet wide in the drift. 



During the past year the company has installed a plant for 

 concentrating the low grade material. The process as described 

 by Edward K. Judd/ consists in passing the ore through a jaw 

 crusher and rolls and treating on hydraulic jigs of the Joplin 

 type. There are eight jigs run by hand and provided with ]/\ 

 inch screens. The arsenopyrite is recovered from the hutch 

 only, the material on the screens being rejected. The jig capa- 

 city is 4^ tons of crude ore or i^4 tons of concentrates each 

 per day. The concentrates average 25 per cent arsenic. 



A sample of the high grade ore gave the following percentages 

 on analysis : 



Silica 2 . 90 



Iron 36 . 1 1 



Copper 2.17 



Sulfur 22 . 72 



Arsenic 36 . 00 



99.90 



Arsenopyrite occurs near Edenville and at other localities in 

 Orange county, and in the town of Lewis, Essex co., 10 miles 

 south of Keeseville. The Edenville deposit carries also leucopy- 

 rite, the diarsenid of iron and scorodite, a hydrous arsenate of 

 iron. 



CEMENT 



L There were few changes of note in the hydraulic cement indus- 

 try during 1907. A fairly active demand existed throughout 

 most of the year, but as in other manufacturing lines a sharp 

 market decline took place in the last three months. Except for 



'Eng. & Min. Jour. Feb. 8, 1908. 



