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Show MINING REVIEW. INTER-MOUNTA- IN described by miners as a contact deposit. According to the researches of Mr. J. Edward Spurr, there is a slight mineralization which is pretty generally distributed throughout the rocks Four assays were made of the basin. of comparatively fresh Eagle Hill were represented by masses of auriferous granite. The feldspathic gangue occurs in some places in a brecciated condition. At Wanns lode, Drake, New England (No. 140) the gold is obtained from a siliceous feldspathic breccia. At the Mount Graham gold mine, Pambu-la- , the occurrence of the gold is described as unlike anything hitherto discovered in any of the Colonies. The lodes are in the main conglomerates and felsitic breccias, in many instances only to be distinguished from the country rock by irregular walls. The gold is extremely fine and difficult to follow; frequently there is nothing to distinfrom the barren guish the portions; the drillings and the mortar are the only guides. Specimens of vesicular and amygda-loidbasalt, claimed to be auriferous, were shown from Black Rock, Bullina. A careful chemical investigation for gold of the basalt of Ovifak, .Greenland, which contains the large and small masses of metallic iron, and which is believed to come from great depths in the earths crust, would be exceedingly interesting. Examples of the presence of gold in granitic and plutonic rocks might be por- phyry. Two assays showed 0.01 ounce of gold to the ton; one showed a trace and the fourth was entirely Of the two assays of the barren. Birdseye porphyry, one showed 0.01 ounce of gold to the ton, the other showed a trace of gold. Xine assays were made of the altered limestone, seven of which showed very small quantities of gold, and two did not yield a trace. Of twelve assays of rock at the contact where there was no evidence of mineralization, nine yielded small quantities of gold, and the other three did not show the presence of gold, gold-beari- al of the metal. The phenomena indicate to me ng that the porphyries and possibly the shales above them are the sources of the gold, but Mr. Spurr concludes that the thickness of the porphyry sheet is so slight that it is not possible that the ores could have been derived from it by multiplied, but those given are suffleaching, and so carried downward into icient to show that we must recognize the limestone, and his explanation, or such rocks as truly theory, is that the mineralizing agents Mining and Metallurgical Patents. rose from below till they met the sheet of altered porphyry, when they spread List of patents relating to mining. Reout along the under contact and so pro- ported for the Mining Review by J. F. Corker, patent solicitor, office No. 311 and duced the mineralization. 312, Atlas block, Salt Lake City, Utah. He also found a series of nearly verfurnished for 15 cents each. tical fineness or fractured zones Copies No. 566,462 Process of Hardening Cophe believes which communicathrough per; J. Miller, Stuart, Iowa: tion was established with a body of The method or process of hardening uneooled igneous rock at an uncertain copper, which consists in first melting copper and adding carbon, next adding depth below, permitting the ascent of horn and blood of animals, next adding moist volcanic vapors, (p. 453). tin, then pouring the molten metallurgiThe researches of Emmons upon the cal compositon into molds and cooling dissemination of gold in the rocks of it, and finally compacting it by pressure. Leadville have added largely to our No. 566,462 Crushing Machine; R. knowledge of this subject. McCully, Philadelphia, Pa.: A shaft for a crushing machine havIn the representative series of gold a conical bearing for a crusher specimens and ores sent by the Minis- ing keyways formed in the face of ter of Mines and Agriculture from New head, said conical bearing and a collar, as South Wales to the Columbian Expo- formed on the shaft below the bearing sition in Chicago in 1893, there were in combination with an anular removaring, as adapted to rest against the numerous specimens from granitic and ble under side of ring , a crusher-hea- d 11 feldspathic lodestuff. Nos. 10, and 12 resting on and keyed to the bearing of the collection were from binary and bolts engaged with the crusher and passing through the removagranite. No. 10 contained gold asso- head ring, whereby the head is clamped ciated with copper pyrites and iron ble to and adjusted on the conical bearing. Ade-lonfrom No. 566,464 Crusher; R. McCully, pyrites the Challenger mine, No. 11 was from the level Philadelphia, Pa.: A shaft for a crushing machine, havof the Great Victoria mine, and No. 12 a conical bearing for a crusher-heaing from the level of the same and keyways in the bearing in seatmine. combination with a crusher-hea- d on the conical bearing and having A pyritous granite was shown from ed tapered keyways formed Dargues Reef, Majors Creek, Braid-woo- downwardly to register with the keyways in said This auriferous stuff is de- bearing; keys of soft metal conformed scribed at 25 feet in width at the in shape to the keyways in the head level. Nos. 23, 24, 25 and 27 of the and conical bearing, bolts running and same collection consisted of auriferous through said keys longitudinally across the same the extending below lode-stufeldspathic from different recess and a collar secured to the shaft, mines at Yalwal, some the recess, and by which the specimens show- below bolts and keys can be drawn down. ing free gold. Feldspathic lode-stuNo. 566,533 Ore Washer and Separatith mispickel and oxidized pyrite is or; C. F. Pike, Philadelphia, Pa.: fmmd also at the Junction In a machine for working placer Reef, of a vessel conAuriferous quartz and feld- gravel, the combination a body of water, a hopperspathic vein-ston- e rich in gold occur in taining at one end and shaped chamber open the Hill End district and at arDelaneys provided with an inclined bottommovvessel, superposed near Molong. ranged in said and-movable rifiled plate screens In the collection from able there Sydney within the said screens below the said 'u-ispecimens with chamber and immersed in the aforesaid gangue from Saw Pit Gulley, body of water, the tail end of said airfield. Three mines at Timbarra screens and rifiled plate projecting fiom gold-bearin- g. g. 978-fo- ot d, 770-fo- ot d. 225-fo- ot ff ff Man-durni- a. a e gold-beari- ng feld-spath- ic 5 the open end of the chamber of the conveyor. Ore Washer and SeparatF. Pike, Philadelphia, Pa.: or; In a machine for working placer gravel, a vessel adapted to contain a body of water, a plurality of superposed screens, and a riffled plate below the same arranged for immersion in such body of water, rock bars or levers to which the screens are pivotally connected at both ends, and a pivotal connection between the head of the riffled plate and the bars and levers; in comNo. 566,534 C. bination with mechanism for imparting a rocking motion to said bars or levers and mechanism at or near the free end of the riffled plate adapted to impart a vertical oscillating motion to said plate on its pivots independently of the screens. Concentrator; P. H. McGowan, Denver, Colo.: A concentrator comprised of a pan having its bottom composed of a series of anular steps descending toward the center and terminating in a dischargeopening at the center, each step having a standing flange or dam at its inner ydge, and' a rotary disk provided with depending agitators or teeth operating over the steps of the said pan; a conical distributor forming the top for the said disk and extended to the outer openedges thereof, ahd a sale conical distributor. the upon ing No. 566,672 Ma thine for Crushing or Pulverizing Ores or Other Substances; No. 566,607 feed-hopp- er R. H. Dundee & F. G. Jones, Cornwall, England: In an ore crusher, the combination with the rotary crusher and a hammer block, of a stationary frame secured to the discharge opening of said cylinder, a screen mounted on said frame, a series of angularly disposed deflectors adjacent to the top of said screen for dimaterial against recting the crushed angularly-disposed the same, and an deflector adjacent to the bottom of the screen for directing insufficiently-crushe- d material beneath the Abstract of Recent Mining Decisions. Reported for the Mining Review by Salt George Westervelt, attorney-at-laLake City, Utah. A Mining Contract. Interpretation. all memorandum of agreement leasing w, the coal in or under a parcel of land, specifically described, the amount of which is to be determined by the actual result of the mining process, and the liability to mine it by the exquantity ofan coal and attendant and executory contract, pense, is not a deed. 32 N. E. 1078, 136 N. Y. 602 followed: Genet v. Pres, etc., Del. & H. O. Co., 37 N. Y. Supp. 1087. (Supreme Court of N. Y. App. Div. 1st Dept., March 20, 1896.) Such contract Negiigenee ganla implies a promise on the part of the lessee that it will not negligently inmining more capacitate itself from of coal, and amount than a minimum fer a wilful neglect of its duties in rethe spect to the method of conducting termia to entitled is work, the lessor nation, though the coal on the land has not been exhausted. Ibid. Lease. Assignment. A lease of a coal mine obligated the lessor not to lease to any other party any coal land to be operated during the life of the lease, and prevented the lessee from with dividing his time or attention reason that any other mine, for the number cn the rent depended lessors of bushels mined. The lessee assigned his interests in the lease, and the ashim from signees sought to restrain mine, on the ground operating anotherbound still by the original that he no lease. Held, that right to insist upon the obligation between lessor and lessee wras transferred to the assignees, but that they acquired simply such under the rights as their assignor inhad his stead by lease, and w'ero bound v. Carson, 66 its obligations. Findlay X. W. Rep. 759. (Supreme Court of w-a- Iowa, April 9, 1S96.) |