THE PROCEEDINGS OF THE COLORADO SCIENTIFIC SOCIETY VOL. V 1894, 1895, 1896 CONTENTS. OFFICIAL PART. PAGE. Abstract of Minutes........................ ...................... v-xxxix Reports of Librarian, Secretary, and Treasurer ........................ xl—xli COMMUNICATIONS. The Mode of Occurrence of Gold in the Ores of the Cripple Creek District; by R. Pearce ............ ------------------ - --------- 5–10 Further Notes on Cripple Creek Ores; by R. Pearce .................. 11–16 The Sanitary Chemical Character of Some of the Artesian Waters of Denver; by W. C. Strong ..................................... 17–23 of the Cripple Creek Gold Mining District; by Whitman Geolog TOSS ................................. .......... ........... 24-49 The Ore Deposits of Cripple Creek; by R. A. F. Penrose, Jr. ......... 50–53 Ore Deposits of Camp Floyd District, Tooele County, Utah; b R. C. Hills ..... ............................................. 54–65 A Suspected New Mineral from Cripple Creek; by F. C. Knight ... ... 66–71 The Gold Ore Deposits of Mount Carribou, Idaho; by E. B. Kirby.... 72–75 Notes on the Geology of the Western Slope of the Sangre de Cristo Range in Costilla County, Colorado; by E. C. and P. H. van Diest ......... ......... ..... ......... ... ......... 76–80 The Sampling and Measurement of Ore Bodies in Mine Examinations; by E. B. Kirby. ............................................. 81–10.5 The Recent History and Present Status of Chemistry; by C. S. Palmer. .......................... ........... ............ 106-120 The Costilla Meteorite; by R. C. Hills ............................. 121–122 Vein Structure in the Enterprise Mine; by T. A. Rickard ............. 123–130 The Determination of Bismuth in Refined Lead and in Lead Bullion; by L. G. Eakins ......... ..... ....... ...... .. .. ....... 131-139 Notes on the Precipitation of the Precious Metals from Cyanide Solutions by Means of Zinc; by N. Anderson .................. 140–143 Occurrence of Tellurium in Oxidized Form Associated with Gold; by R. Pearce .............................................. .. 144-147 The Volcanic Rock of Alum Hill, Boulder County, Colorado; by C. I. Andrews . ....... .............. ... .. ... ---------------- 148–155 Some Notes on the Occurrence of Uraninite in Colorado; by R. Pearce. 156–158 The Dike on the Columbia Vein in Ward District, Boulder County, Colorado; by C. S. Palmer and W. B. Stoddard .............. 159–164 Spherulites Containing Chalcedony and Opal in Colorado; by H. B. Patton .................................................... 165–170 Peculiar Geological Formations on the Head Waters of the Rio Grande, Colorado; by H. B. Patton ........................... 171-172 The Nickel Deposits near Riddle's, Oregon; by W. L. Austin ........ .173–196 Q: 5 & SQ CONTENTS. PAGE. The Technical Determination of Iron; by L. J. W. Jones. ............ 197-209 On Pearceite, a Sulpharsenite of Silver, and on the Crystallization of Polybasite; by S. L. Penfield ................................. 210–224 Igneous Rocks of the Telluride District, Colorado; by Whitman Cross.225-234 The San Miguel Formation; by Whitman Cross. ..................... 235–241 Notes on the Occurrence of a Rich Silver and Gold Mineral Containing Tellurium, in the Griffith Lode, near Georgetown, Clear Creek County, Colorado; by R. Pearce ............................... 242-243 Notes on the Occurrence of Tellurium in an Oxidized Form in Montana: by R. Pearce... ........ ........................... ... ....... 244–245 An Automatic Water Recording Gauge: by E. LeN. Foster. .......... 246-248 Necrology – C. O. Shields ... ................... ............... ... 249 ILLUSTRATIONS. PAGE. Specimen from the Moose Mine, Cripple Creek. ..................... 11 Diagramatic Section of the Mercur Quaquaversal .................... 56 Diagramatic Section of a Portion of the Mercur Ore Body............ 58 Map of a Portion of the Western Slope of the Sangre de Cristo Moun tains. ...... ............ ............. ................ .... 80 Plates I–IV accompanying the article on the Sampling and Measure ment of Ore ------------------------- - ----------------- 104 The Costilla Meteorite .............................................. 122 accompanying' Enterprise Plates the article on Vein Structure in the Mine. ............. .................... ............. ... 123 Dike of the Columbia Vein ......................................... 161 Spherulites in Obsidian and Rhyolite ........................ *- - - - - - - 170 Peculiar Geological Formations at the Head Waters of the Rio Grande (two plates). ............................. ........ .......... 171 View of Cow Creek Valley from Piney Mountain ..................... 173 Map of Southwestern Oregon. ....................................... 174 Geological Map of Piney Mountain ......................... --------- 178 Piney Mountain ....... ................ ............ .............. 180 Nickel, Fig. 5. ......... ............ ............ .............. 182 View of Open Cut and Tunnel, Fig. 6................................ 186 Showing Cropping of Vein, Fig. 7.... ..................... .......... 186 Nickel, Fig. 8 ........... .............. .......................... 187 Nickel, Fig. 9... ....... .............. ................ ............ 188 Nickel, Fig. 10. .................... --------------------------------- 191 Automatic Water Recording Gauge ... ............................ 248 vi ABSTRACT OF MINUTES. ONE HUNDRED AND TENTH REGULAR MEETING. February 5th, 1894. In the Society Rooms, High School Building. The President in the Chair. Twenty-six persons present. Messrs. Wm. H. Smiley, A. F. Wuensch, Willard S. Morse, Chas. T. Carnahan, E. C. Engelhardt, and Hal. W. Hardinge, were elected members, and Mr. L. C. Jakway an associate member. Mr. John B. Farrish presented the report of the Committee which had charge of the arrangements for the annual dinner of the Society, which was given in January. The Librarian reported the donation of books to the Society * by Mr. S. F. Emmons. A vote of thanks to Mr. Emmons was passed. CoMMUNICATIONS.–Professor H. van F. Furman read a paper on “The Refining of Gold as Practiced in the U. S. Mint.” Mr. T. A. Rickard discussed “The Geology of the Metalifer ous Mines at Pontgibaud, France.” ONE HUND RED AND ELEVENTH REGULAR MEETING. March 5th, 1894. In the Society Rooms, High School Building. The Second Vice-President in the Chair. Twenty persons present. Messrs. E. E. Olcott, John A. Church, Wm. A. Hover, and ABSTRACT OF MINUTES. vii George R. Hurlburt were elected members, and Mr. Jas. A. McClurg an associate member. The Committee appointed to audit the accounts of the Treas urer presented its report. COMMUNICATIONS.–Mr. A. A. Blow gave an interesting lecture on “The Gold Belt of Leadville.” Mr. Blow's discourse was sub divided into the following headings: 1. The locus of the gold ore chutes. These are embraced within the area lying about two miles to the east of Leadville in a comparatively unexplored territory known as “Breece Hill.” 2. The trend of the chutes. He believes this to be identical with that of a number of prominent ore chutes on “Iron Hill,” and was furthermore of the opinion that the gold ore chutes might possibly be found to be continuations of the silver ore chutes. 3. The character of the ore. It is highly siliceous, and but little silver and lead are found associated with the gold. 4. The occurrence of the ore. This is not confined to any special zones. It occurs both in the limestone and the porphyries (white and gray), or in the contact planes between the two. In connection with the gold ore deposits there occur intrusive dikes of porphyries younger than both the white and gray porphyries which characterize the silver deposits of Leadville. These younger eruptives appear to be intimately associated with the gold deposits, and may have influenced the deposition. ONE HUND RED AND TWELFTH REGULAR MEETING. April 2nd, 1894. In the Society Rooms, High School Building. Dr. Richard Pearce, Chairman Pro-Tem. Twenty persons present. ABSTRACT OF MINUTES. ix tance in aiding the Society to obtain its new quarters at a very moderate monthly rental. The motion was unanimously carried. Messrs. E. L. Newhouse, C. W. Goodale, and A. R. Nickels were elected members. COMMUNICATIONS.–Professor Wm. C. Strong read a paper on “The Sanitary Features of the Artesian Waters of Denver.” ONE HUND RED AND FOURTEENTH is blo;ULA it MEETING. June 4th, 1894. In the Society Rooms, Boston Building. The President in the Chair. Forty-eight persons were present. Messrs Wesley Brainerd, Edwin E. Chase, J. T. Eskridge, and H. W. McLaughlin were elected members, and Mr. Chas. R. Dudley an associate member. The Curator exhibited some mineral specimens of gypsum presented to the Society by Mr. W. S. Ward, and also some fossils given the Society by Dr. Wm. P. Headden. He also brought up the matter of a fossil plant collection which he had undertaken to gather jointly with the late Professor Newberry of Columbia College, N. Y. This collection belonged in part to Mr. Hills per sonally, in part to the Society, and in part to Professor Newberry. A portion of the Society's share was in possession of Professor Newberry when he died. Mr. Hills had corresponded with the Trustees of Columbia College regarding this collection and had learned that Professor Newberry's entire collection had been left to the College and that it was impossible to select out and turn over to the Society that portion of the fossil plant collection which