The Proceedings of the Colorado Scientific SocietyColorado Scientific Society., 1896 |
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alkaline ammonia amount analysis andesite appears assay value associated auriferous average beds bismuth Boston Building breccia calcium oxide carbonate cent chemical chemistry chert chloride color Colorado conglomerate containing copper Cripple Creek District crystalline crystals cyanide of zinc decomposed Denver deposits determined Diest dikes dilute eruptive feet feldspar ferric filter fissures fluorite formation fragments free gold genthite geological gram granite Gulch Hill hydrochloric acid inches iron latter lead limestone lode mass material measured method miles mineral mines Mountain nickel obsidian occur oxide paper pay areas Pearce phonolite polybasite porphyritic portion potassium precipitate present probable pyrite quantity quartz quartzite reduction region rhodochrosite rhyolite Richard Pearce rock sample San Juan San Miguel sandstone saxonite silica silver Society Rooms solution specimen spherulites stopes structure sulphate sulphides sulphuric acid surface sylvanite telluride tellurium thickness tion titration unoxidized uraninite variety vein volcanic zinc
Beliebte Passagen
Seite 210 - Ag.AsS, a distinct species. For the arsenical mineral he takes pleasure in proposing the name pearceite as a compliment to his friend, Dr. Richard Pearce, of Denver, whose keen interest in mineralogy and connection with one of the large smelting and refining works of Colorado have made him known both to scientific men and to those interested in the development of the mining industries of the Rocky Mountain region.
Seite 97 - XIII, where the thickness and value of the ore-sheet cut by each pit is given by figures. The outer line is the adopted limit within which the ore-body is considered probable, and the dotted lines show the area allotted to each sample point. Each area is multiplied by the ore thickness to give the volume, and this is multiplied by its sample value. The sum of the products is then divided by the sum of the volumes. THE MEASUREMENT AND ASSAY VALUE OF VOLUMES. The object of measurement is always to...
Seite 210 - Fe = 255 : 143 : 19, and calculating the theoretical composition, results agreeing very satisfactorily with the analysis are obtained. Although recognizing that antimony and arsenic are isomorphous and may mutually replace one another, it is customary and has been found convenient in mineralogy to consider the sulphantimonites and sulpharsenites as distinct species, and to designate them by different names, and the author proposes that hereafter the name polybasite shall be restricted to the antimony...
Seite 212 - ... f°, s and s° and u and u°, are very often present. When q was observed it was always a prominent, dull face, not sharing in the horizontal striations of the other faces of the zone. It was only occasionally that forms were observed between c, 001 and I, 310, and they were always small, while the corresponding forms were not observed between 001 and 310. The pinacoid b, 010 was identified, not only by the symmetrical arrangement of the forms with reference to it, but also by the similarity...
Seite 240 - Notes on the occurrence of a rich silver and gold mineral containing tellurium, in the Griffith lode, near Georgetown, Clear Creek County, Colorado.
Seite 83 - Ore body. Generally a solid and fairly continuous mass of ore, which may Include low-grade and waste as well as pay ore, but Is Individualized by form or character from adjoining country rock. Ore-bridge. A large electric gantrytype of crane which, by means of a clamshell bucket, stocks ore or carries It from the stock pile Into bins or larry car on trestle.
Seite 212 - The crystals are opaque, so that optical tests could not be applied as was done by Miers,* who has described this kind of twinning on polybasite. If the twinning occurs on pearceite, as it probably does, it must cause uncertainty as to the identification of some of the forms in the zones between c and a and c and m, and it may also account in part for the decidedly rhombohedral aspect of many of the crystals. As far as could be observed, similar faces are often developed about equally above and below...
Seite 107 - Yet all these were when no man did them know, Yet have from wisest ages hidden beene; And later times thinges more unknowne shall show. Why then should witlesse man so much misweene, That nothing is, but that which he hath seene?
Seite 208 - Iron 1.05 Insoluble 0.42 99.85 Professor Penfield says: "It cannot claim to be a new mineral, for as an arsenical variety of polybasite it has previously been recognized, although no special name has been assigned to it While recognizing that antimony and arsenic are isomorphous and may mutually replace one another, it is customary and has been found convenient in mineralogy to consider the sulphantimonites and sulpharsenites as distinct species, and to designate '"On Pearceite, a Sulpharsenite of...
Seite 190 - The branching starting from the vein of genthite, together with the manner in which the arms gradually fade away into the serpentine at once suggests the source from which the geuthite has been drawn. The genthite and serpentine are thoroughly intermingled, but the former is generally present in such small quantities as to be overlooked unless it is the object of special research. It occurs in the serpentine directly connected with the grains of olivine from which the serpentine has been derived,...