1922] A Magnetite-Marble Ore at Lansing, N. C. 139 



Capt. Geo. W. Cooke, who is operating the mine for the company, 

 declares that the present mine is on the Waughbank property but that 

 the original opening which dates back as early as 1828 was on top of 

 the hill about 50 feet above the present tunnel and was in an entirely 

 different kind of ore, The tunnel of the Penna. Steel Co. was opened 

 about 15 years ago into the lower portion of the Waughbank deposit. 

 It is parallel to the present tunnel, about 40 feet above it and about 

 100 feet further west. It is frequently referred to as the upper level. 

 'At its end, at the bottom of the AVaughbank pit, a little limestone ore 

 was encountered, but most of the ore developed by it was of the sili- 

 ceous type like that at Cranberry. The relations of the two tunnels 

 to one another and the mutual relationships of the siliceous ore and 

 that now being worked are shown in the sketch, pi. 25. 



THE ASHE MINING COMPANY'S MINE 



Mineral Conhposition of the Ore : — The ore of the deposit now 

 being worked is essentially a coarsely granular intermixture of mag- 

 nesian marble and magnetite (pi. 26). Here and there are particles 

 of quartz but they are rare. The carbonates are in large grains with 

 perfect cleavage constituting a white marble. The magnetite is in 

 irregular though slightly elongated grains scattered through the 

 marble, producing an ill-defined schistosity, which is emphasized by 

 the occasional accumulation of the magnetite grains in lenses with their 

 long axes parallel to the obscure schistosity of the matrix of carbonates 

 and magnetite in which thej' lie. (See pi. 26.) In a few places the 

 rock is markedly schistose. This is brought about either by the oc- 

 currence of many of the magnetite grains in plates, suggesting the 

 plates of hematite in specular ores, or by its occurrence in numerous 

 small lenses elongate in parallel directions. Many of the elongate 

 grains are sheared and drawn out into lines or rows of sharp-edged 

 particles. The carbonate grains associated with the magnetite show 

 no similar elongation, but the schistosity is often accentuated by the 

 presence of calcite veins or layers running in the same direction as 

 the lines of magnetite plates. Evidently the carbonates have been en- 

 tirely recrystallized since the rock's deformation. Here and there 

 through the mass are embedded small garnets, which in many cases 

 are altered so as to give rise to light brown stains. 



A typical lean ore in thin section shows coarse-grained aggregates 

 of two colorless carbonates, of which one is calcite and the other prob- 



