24 Bulletin of the New York State Museum. 



HOBBY OPENING-, Patterson, Putnam County. — A pyritif- 

 erous ore was discovered on this property, two miles south-west of 

 Towner's Station, in 1882. It has not been developed into a pro- 

 ductive mine. 



II -THE ADIRONDACK REGION, INCLUDING THE LAKE 

 CHAMPLAIN MINES -MAGNETIC IRON ORES. 



MT. HOPE, FORT ANN AND POTTER MINES, Fort Ann, 

 Washington County. — These mines are in the western part of the 

 town of Port Ann, and five miles north-west of Port Ann station on 

 the New York and Canada railroad. They are opened on parallel 

 " veins," which dip at an average angle of 30° to the north-east. 

 The Mt. Hope is on a ridge of the same name, and a half mile north- 

 west of the Potter. It has been opened for a length of 50 to 60 

 rods, and to a depth of 100 feet. The Port Ann has been sunk to a 

 maximum depth of 300 feet, and has been opened for 80 rods on the 

 course of the ore. The Potter is only 30 rods in length and 75 feet 

 deep. These mines have been idle for several years, owing to the low 

 price of ore and the cost of carting it to Fort Ann — a distance, by 

 wagon road, of seven miles. The ores are all Bessemer, containing 

 on an average, .034 of phosphorus. The Mt. Hope is rather lean, 

 as compared with the Potter and Fort Ann. The Potter mine was 

 first opened in 1879 ; the Fort Ann at least twenty years, and the 

 Mt. Hope more than thirty years ago. The total production is esti- 

 mated to have been 350,000 tons. The mines are owned by Hon. 

 Joseph Potter, of Whitehall, and Hon. John F. Winslow, of 

 Poughkeepsie. 



WARRENSBURGH MINE, Warrensburgh, Warren County.— 

 Iron ore was mined near this village more than fifty years ago. It 

 has not been in operation for many years. 



VINEYARD MINE, BURLEIGH SHAFT, Ticonderoga, Essex 

 County. — The Lake Champlain Ore and Transportation Company 

 opened the ore bed on this old iron-ore property in 1887. The 

 Vineyard mine was opened about forty years ago, and worked in a 

 small way. The mine is one and a half miles west of Lake Champlain, 

 and four miles north-west of Ticonderoga. The ore cropped out 

 originally in a glaciated ledge. The course of the ore bed is north, 

 30° east, and its dip 52° to the north-west. The greatest depth 



