Daily Arizona silver belt., 1909-08-25

LOS ANGELES, August 24.--At the present time Los Angeles is one of the few cities of it's size and importance in the United States which has no pub lie reference collection of minerals, ores and non-metallic geologic products of economic importance. Realizing the importance such an exhibit would ex- ert in stimulating public interest in mining matters, and feeling that the Los Angeles Chamber of Mines is the logical sponsor for such an exhibit, the following plans suggested by the min eral exhibit committee, have been a2- proved aad adopted ly tie board of directors of ihe chamber.
 1t is considered desirable to build up in Los Angeles two distinct collections. one an exhibit of economic geology in cluding the ores, petroleum and other economic productions of the territory tributary to Los Angeles; the other a mining exhibit. which shall show both the commercial importance and the geology of the various mineral districts of the southwest.
 Exhibit of Economic Geology
 This will be reference collection of the varions ores, arranged according to the metal for which they are valuable. Each specimen will be authoritatively identified both as to species and local l ity. which data will be plainly exhibit cd on n uniform label The collection will exhibit the following mineral and geologic products; Petroleum and it's products, clays, clap products and building stone, cement rock, gypsum graphite, road metal, gems and gem bearing rocks, natural fertilizers, and any other geologic products that may be found in the region tributary to Los Angeles.
 | For this exhibit the chamber desires good sized specimens of very high grade ore to illustrate the several min erals which are valuable for the par ticular metal they contain. Examples: Galentine, eerussite. wulfenite. etc. to represent ores of native lead; native copper, malachite, azurite, ehaleo- pyrite, bornite. cuprite. etc, to repre- sent ores of copper). In the non-metal- lie department it will be necessary to useful for in the commercial world. | Example: Graphite, and its finished form as pencils, lubricant, paint, cruel bles, stove polish, etc.)
 Mining Exhibit
 This collection win he exhibited on tables and open to t'e close scrutiny of the public, as it is felt that the nature of the collection necessitates its exam. ination at close range by those inter ested in order to be of full value. As it will contain no specimens of intrinsic value. there should be no temptation to pilfer, and the chamber anticipates that the public will recognize the ad- vantage of this feature and protect the collection.
 This exhibit will present, in groups, specimens of the country rocks, or walls of the ore deposits; samples of the average ore as mined, and speci- mems of high grade ore. from the varl- ous mines of the southwest. Such group, representing each mine separate lv, will be exhibited on a uniform card of suitable size. This card will bear large label stating the name and loca- ton of the mine, and each specimen will have separate label, stating m as few words as possible, what it rep resents.
 For this exhibit there will he desired lthe following from each mine: Spec'- linens of the country rocks and walls 0f the ore deposits. taken where the rock lis fresh and undecomposed. If several idiirerent rocks occu, n the region of the mine they all should be represent cd. These specimens should be clipped to uniform size of 3x3Rxlla inches. This should be done in the field where there is plenty of material to select from. The average ore of the mine should be represented by several frag- ments. rather than by a single speci- men. The average assay value of the ore represented should be stated, Speei- mens of high grade ore can usually be ! trimmed to the above mentioned si2e' but when this would injure specimen, the high grade may be represented by several fragments This specimen must illustrate the 'high grade' product of the mine. and must not be confined to the finest specimen available. It should be accompanied by statement of the general value of the high grade product. Photographs of the opt-crops, or other vein exposures would be ae- ceptable and for the filing cabinet photographs of the camp and mine i'm provements would be greatly appre- ciated. Each specimen must be careful ly identified as to what part Of the mine it comes from and what it repre-