Was andere dazu sagen - Rezension schreiben
Es wurden keine Rezensionen gefunden.
Andere Ausgaben - Alle anzeigen
Abella Abra Albay Ambos Camarines American amount analyses andesite Angat archipelago assays Baguio Batan Island beds Benguet Bulacan Camarines carbon Cebu cent clay coast concessions considerable copper Danao deposits diorite district dredge east eastern engineer Eocene extent feet field Filipinos formation furnace geological gold igneous Igorots Ilocos Norte important inches industry iron Jolo kaolin known labor Lepanto lignite limestone located Luzon Mambulao Mancayan Manila Marinduque Masbate metal meters miles mill Mindanao Mindoro mineral resources mining bureau Moro mountain natives Nueva Nueva Ecija obtained operations outcrop oxide Paracale pearl Philippine coals Philippine Commission Philippine Islands pounds present probably prospecting prospectors province pyrite quantity quartz region River rock samples seams shells Spanish springs stream sulphur Sultan Sulu Surigao survey Suyoc Tayabas thickness timber tion trachyte transportation tunnel veins volatile volcanic
Seite 37 - All valuable mineral deposits in lands belonging to the United States, both surveyed and unsurveyed, are hereby declared to be free and open to exploration and purchase, and the lands in which they are found to occupation and purchase, by citizens of the United States...
Seite 109 - Mining Bureau; to make a collection of models, drawings, and descriptions of the mechanical appliances used in mining and metallurgical processes; to preserve and so maintain such collections and library as to make them available for reference and examination, and open to public inspection at reasonable hours; to maintain, in effect, a bureau of information concerning the mineral industries of this State...
Seite 549 - ... or revenue service of the United States, when so instructed by the President, to seize and arrest all vessels of the United States found by him to be engaged, used, or employed in the waters last aforesaid in violation of any of the prohibitions of this act or of any regulations made thereunder, and to take the same, with all persons on board thereof, to the most convenient port in any district of the United States mentioned in this act, there to be dealt with according to law.
Seite 543 - Provided, That no article of this paragraph shall pay a less rate of duty than twenty-five per centum ad valorem.
Seite 109 - It shall be his duty: to collect statistics concerning the occurrence and production of the economically important minerals and the methods pursued in making their valuable constituents available for commercial use...
Seite 7 - Mindanao, being practically unexplored, is full of possibilities, but as yet no important copper deposit is known to exist there. An attempt was made to work the deposit in Masbate, but no success seems to have been attained.
Seite 471 - High-grade clays show a percentage of silica, alumina, and water approaching quite closely to those of kaolinite. " 2. The refractoriness of the clay for, other things being equal, the greater the total sum of fluxing impurities, the more fusible the clay. "3. The color to which the clay burns. This may be judged approximately, for clays with several per...
Seite 62 - ... rocks, at least, date back nearly to the great upheaval. Among these rocks, also, there is sometimes a tendency for the basalts to follow the andesites, but the one dacite found at Corregidor is later than the andesites of that island. The relation of the trachytes to the andesites is not certain, but the sanidine rock is probably the earlier. A very large part of the neovolcanic ejecta has fallen into water and been rearranged as tuffaceous plains. The...
Seite 62 - The diorites and associated massive rocks, including their tuffs, may have made their appearance about the close of the Paleozoic. The less siliceous of these rocks seem to have followed the more siliceous intrusions as a whole. The gold deposits, and perhaps other ores, are so associated with these massive rocks as to indicate a genetic relation. The neovolcanic period began as early as the highest Miocene horizon, and very probably at post-Eocene upheaval.
Seite 5 - Though a considerable amount of coal has been extracted here, the industry has not .been a profitable one hitherto. This is, at least in part, due to crude methods of transportation. It is said, however, that the seams are often badly faulted. At Uling, about 10 miles west of the capital, the seams reach a maximum thickness of 15£ feet.