rAiN.l MINKS AND PROSPECTS. 45 



split-^ niiinini>- off from tlx' main vein. These have a course about 

 N. 8i)° E. The old working extends to a depth of '213 feet, and drifts 

 have been run in both directions at depths of 80, ()0, 135, IGO, and 210 

 feet. At present such of these slopes as can be entered sliow consider- 

 able bodies of clear fluorspar, mainly white, l)ut Avith subordinate 

 amounts of purple. In the fluor.spar are small launches of gakMia and 

 blende. Minor amounts of pyi'ite and chalcopyrite occur and stibnite 

 and janiesonite are reported. While the sulphides occasionally 

 occupy distinct veinlets or occur in definite bands, they are more com- 

 monly completely intergrown Avith the spar. Calcite is also exten- 

 sively developed, especially in the foot wall. No distinct crustifica - 

 tion indicating a definite order of deposition of the various minerals 

 can be made out, and there are no satisfactory evidences of differences 

 in the character of the ore body at different levels. Certain of the 

 old slopes showed chambers of considerable size, 15 to IG feet wide, 

 20 to 25 feet high, and 40 feet or moi"e long, with roof and face of 

 fluorspar. In view of the fact that the property was formerly 

 worked for galena alone, these chambers corroborate the statenuMits 

 made by NorAvood and others as to the large size of the bodies of 

 lead ore formerly found. Mr. Eilers estimated that at the time of his 

 visit there Avas in one slope a body of ore 20 f.'et wide, 20 feet high, 

 and 50 to GO feet long, Avhich Avould run 10 to 15 per cent galena. At 

 the same time another slope 138 feet long Avas Anelding ore Avhich the 

 owners stated ran 13 per cent of dressed galena. At present there are 

 no considerable bodies of galena in sight, as all availal)le ore of that 

 kind had evidently been removed before mining sto|)ped. Tt has 

 been estimated, however, that there are reserves of 25.000 tons of 

 fluorspar in the ground now open. 



From the main shaft the vein has been opened a distance of 

 approximately 150 feet in each direction. To the northeast, hoAV- 

 eA'er, the vein has been mined through a number of other shafts 

 up to the boundary line of the property, and practically continuous 

 sloping has been done from the FairA^eAv to the Rosiclare shaft. 

 While the ore body is thus continuous from one mine to the other, 

 the recent Avork indicates that the Iavo mines are on separate fault 

 planes. If the Rosiclare vein be projected to the soutliAvest on an 

 accurate base it passes through one, at least, of the shafts Avhich 

 mi'.rk the Anderson Well A-ein, the first to be discovered. The course 

 of the latter as generally given in N. 3° E., while the Rosiclare vein 

 runs N. 18° E. (true). Since, hoAvever, the Anderson Well A^ein 

 Avas never Avorked, not nnich importance is to be attached to the 

 early determination of its course. 



liosidai'e mine. — The Rosiclare mine has probably the longest 

 record of nearly continuous production in the district. It is also the 



