ABADILLA, Q. A., 1935, Geology of the white-clay deposits in Siruma Peninsula, Camarines Sur, Luzon, The Philippine Journal of Science, 1, 227-232 pp.

Industrial Mineral Deposits;

            The clay deposits in Siruma, as stated above , are of alluvial origin and of mantle form.  That the deposit may extend in depth below the levelof the creeks or even belowsea level in some locality is possible, as there may have been deposition of clay before the recent subsidence of Siruma is that of many small deposits scattered over a wide area.  While their aerial extent and depth are not fully determined, it is very probable that an aggregate of atl least 15,000 tons of clay may be available from the different deposits which are known at present.

 

ABADILLA, J. M. and CORPUZ, C. L., 1981, Preliminary technical and operating studies for the Sinidangan and Maligligay feldsphatic clay prospects within the Northern Ilocos Norte Forest Reserve, MGB Internal Report: ILN-5080, 11 pp.

Industrial Mineral Deposits;

            The feldspathic clay deposits in the subject areas are genetically related to the intrusive leucocratic quartz diorite.  In general, the clay is white to creamy, very fine but gritty due to the presence of free quartz crystals and small fragments of partially weathered parent rocks oxidation of the accessory mafic minerals produced the rusty spots deleterious to the feldspathic clay.  These impurities, however, are within tolerable limits.  Red soils overburden averages 4 meters thick and forest cover is relatively thin.

 

ABIOG, D. B., 1968, Memorandum report on a spot investigation of red clay derived from chemical weathering of pyroclastic rocks in Kalayaan, Laguna., MGB Internal Report: LA-821, 4 pp.

Industrial Mineral Deposits;

            Extensive red clay derived from intensive chemical decomposition of pyroclastic rocks occur on a plateau-like area at elevation of 300 meters above sea level in the eastern part of Bo. San Juan and Bo. Longos, kalayaan, Laguna. Present findings indicate that the top soil has a thickness that ranges from one meter to 5 meters and the sub-soil or red-clay which is believed to be rich in aluminous and iron oxides and hydroxides will probably extend to considerable depth as has been observed in a number of places.

 

ADRIANO, P. L. and QUEBRAL, R. D., 1982, Progress report on the reconnaissance geological survey  of Northeastern Mindoro for Ceramic Raw Materials, MGB Internal Report: Prog-1800, 6 pp.

Industrial Mineral Deposits;

            A reconnaissance survey has showed that non-refractory clay deposits with low PCE values of Cone 5 has been found to be favorable sources of red burning clay which can be utilized for producing bricks, roofing tiles and other ceramic products.

 

ADRIANO, P. L. and QUEBRAL, R. D., 1983, Semi-detailed geologic survey of white clay deposits and other ceramic raw materials in Bamban-Doliman area, Infanta, Pangasinan, MGB Internal Report: PS-5004, 9 pp.

Industrial Mineral Deposits;

            Generally, the clay deposits in Bamban and Doliman are of hydrothermal origin and they are found in small lenses and pockets on a deeply weathered gabbroic rocks.  The sporadic occurrence of the deposits compounded with thick soil overburden makes it difficult to trace their lateral extensions.  However, based from present workings, outcrops, and analysis of samples, the aggregate indicated marginal reserves of about 9,194,500 MT of white and feldspathic clay was estimated.  These clays can be used in ceramic industry especially in stonewares, sanitarywares, and also as binders in medium duty refractory.

 

ADRIANO, P. L. and GUEVARRA, L. E., 1986, Progress report on the canvassing and reserve estimation of silica and white clay deposits and other industrial minerals of Bulacan Province, MGB Internal Report: PROG-500, 12 pp.

Industrial Mineral Deposits;

            The Nonmetallic Section of the Geological Survey Division is currently undertaking mineral canvassing of industrial rocks and minerals all over the country with emphasis on reserve estimation, their specifications and their uses in industries.

 

ALFARO, N. P. and HERNANDEZ, F. C., 1980, Report on the canvassing of clay deposits in La Union Province, MGB Internal Report: LU-2066, 9 pp.

Industrial Mineral Deposits;

            In connection with the request of the Ministry of Human Settlements to tap potential clay deposits in the Philippines to be used for the production of building bricks for BLISS Housing Project, the Bureau of Mines and Geo-Sciences, Baguio City designated the writers to conduct field survey and assessment of clay deposits in La Union Province. A proposed brick plant is to be installed in San Fernando, La Union. Fieldwork was conducted from September 3-17, 1980 in the towns of Aringay, Bauang, San Fernando, San Juan, and Luna. These towns are accessible along MacArthur Highway which is regularly traversed by passenger busses and jeeps. San Fernando, La Union is about 269 kilometers from Manila. Access to interior areas is through foot trails and newly constructed barangay roads.

 

ALMEDA, R. L. and ESPERIDION, J. A., 1976, Progress report on the geological/geochemical survey of Southwestern Negros, MGB Internal Report: Prog-75, 1 pp.

Exploration Geochemistry;

            The area covered is approximately 17,000 Has. constituting 605 of the target area in Has. which is 30,000 Has.  A total of 170 stream sediments for geochemical analysis, thirty-eighty (38) rock samples for paleontological dating and forty (40) rock samples fro petrographic analysis, were collected

 

ANG, V. C., Jr., 1985, Report on the geological investigation and reserve evaluation of the clay deposit in Maripipi Island, Leyte, MGB Internal Report: LE-5005, 10 pp.

Industrial Mineral Deposits;

            The clay deposit of Maripipi Island is the residual product of the weathering in-situ of the underlying porphyritic andesite of quaternary age.  The clay deposits are found along the gentle slopes, depressions and flat surfaces atop elevated areas of the island and occur as mantle of the volcanic rocks, restricted in extent and have accumulated under favorable geologic conditions, i,e, suitable weather/climate, good depositional environment  and susceptible source or parent rocks.

 

ANGELES, C. A., 1980, Monthly progress report on the reconnaissance geological survey of clay deposit in Tarlac Province, MGB Internal Report: Prog-182, 3 pp.

Industrial Mineral Deposits;

            no abstract/conclusion

 

ANTONIO, I. S., 1959, The Sipit clay deposits at Bitin, Bay, Laguna, MGB Internal Report: LA287, 17 pp.

Industrial Mineral Deposits;

            The clay deposits located in the barrio of Bitin, town of Bay, Laguna are accessible by 71 km road from Manila and thence by four kilometers foot trail from the barrio of San Pablo, Sto. Tomas, Batangas.The clay deposits originated from the hydrothermal alterations of existing rocks consisting of tuffaceous materials and the underlying volcanic rocks.

 

ANTONIO, L. R., 1968, Notes on the geology of NW Zamboanga Del Norte, Mindanao, Philippines, MGB Internal Report: ZM-676, 9 pp.

Stratigraphy;

            The regional geological mapping of Northern Zamboanga Peninsula was undertaken by the Bureau of Mines in conjunction with the geological and metallogenic mapping program of the Philippine Archipelago.  The rocks within the area covered were mapped into 12 rock units including alluvium.  Some of them are sedimentary or mostly sedimentary and stratified rocks with volcanics or their metamorphosed equivalent, while the remaining is an igneous intrusive.  Mineral deposits found within the mapped area include asbestos, copper, laterite, manganese, iron, limestone and enormous quantity of sand and gravel deposits.  Perennial rivers, and streams are found in strategic places that can be developed for commercial and/or local consumption.

 

ANTONIO, L. R., 1974, Geology and mineral resources of Cagayan Province, MGB Internal Report: GMR-11, 25 pp.

Mineral Economics;

            Cagayan Province does not have any reported base metal resources other than iron and such non-metallic minerals as sulfur, gypsum, clay, and limestone.  The iron deposits are principally located at the northern part of the province.  The deposits are either in massive lode or as beach sand materials.  The different mineral deposits in the province are herein described.

 

ARCO, R. C., 1958, Preliminary report on the geological investigation of Phosphatic Limestone Cebu, MGB Internal Report: CE- 393, 40 pp.

Industrial Mineral Deposits;

            The area mapped included the entire province of Cebu, particularly the Carcar limestone.  The central part of Cebu where the Orbitoid limstone , Uling limestone and the Barili limestone were noted also geologically studied for phosphate deposits. The Cacar limestone were observed to have many caves, sink holes, and large cavities.  The phosphate rock deposits fall under 4 types : Granular sandy, oolitic massive, nodular , phosphatic clay.

 

ARCO, R. C., 1962, Geologic reconnaissance and mineral resources of Bohol province, Philippines, MGB Internal Report: BO394, 1-68 pp.

Industrial Mineral Deposits;Metallic Mineral Deposits

            The area mapped includes the mainland of Bohol and the 61 islands and islets covering about 4,078.37 square kilometers.  Several formations believed to be Pre-Tertiary include the Alicia schist, Ubay volcanics, Bactol serpentinite, and Talibon diorite.  Tertiary formations are the Wahig limestone, Jagna andesite, Carmen formation, Sierra Bullones Limestone, Kabulao conglomerate, Maribojoc limestone.  The ages of the Tertiary dated sedimentary rocks range from 04,5 (Wahig) to g-h (Maribojoc).  Recent deposits consist essentially of alluvium. Prominent physiographic units are depicted in the mainland and include : eastern and western mountain ranges, the vast expanse of relatively gently rolling plains in the Carmen area, the beautifully arranged, symmetrically formed "haycock hills" in Carmen-Batuon-Bilar-Borja-Balilihan area, elongated cluster of hills of moderate height in the Ubay-San Pascual area, Anda and Loon elevated Plateaus, Plio-Pleistocene terrace levels etched in Carmen sandstone and shales, and teh "Ilihan plug" at Tubigon. The mainland of Bohol is a broad southward plunging syncline with anticlines on the Sierra Bullones mountain range and Tubigon.  Minor synclines are mapped in Buenavista and Colonia-Mahayag areas.  During Maribojoc time, the mainland was perhaps tilted a little to the southwest, allowing sea transgression and limestone deposition. Several metallic prospects were observed in the following localities: Bass-Bagacay, Campacot and Balisong in Talibon, Buli and Bonakan in Jetafe, Colonia and Buenavista in Carmen, Guindulman and Anda, Bungwalog, Duaro, Nagasnas, Alicia, Bactol, Jagna, Tambu, Mabini, Tugma, Jetafe, Danao Valley, Talibon and Inabanga.  The copper prospects of the province need some more prospecting and geochemical study. The establishment of the Loboc hydroelectric power plant will generate the creation of a series of cottage industries utilizing as raw materials the non-metallic deposits like guano, lime, and clay of the mainland.  Although the local clay is of the low rank, ordinary kitchenware for local requirements may be supplied.

 

ARCO, R. C., 1962, Preliminary report on the geologic investigation of phosphate rock in Cebu Island, MGB Internal Report: CE-631, 40 pp.

Industrial Mineral Deposits;

            The area mapped included generally the entire Province of Cebu, particularly the portion underlain by Carcar Limestone, the youngest limestone formation. The central part of Cebu where the orbitoid limestone, Uling Limestone and the Barili Limestones were noted and  were also geologically studied for phosphate rock potential. The ages of these limestone formations range from Tertiary f to Tertiary h.  The Carcar Limestone in  Tuburan, Asturias, Balamban and Ronda were observed to have numerous caves, sink holes and large cavities. The caves contain varying amounts of phosphate rock of the massive to oolitic type averaging in places above 20%P2O5. Most of the sink holes contain phosphatic clays of low P2O5 content. Some limestone cavities were seen to have phosphate coatings of limited thickness. The slopes of Carcar limestone are strewn with phosphatic  boulder floats. The float are irregularly distributed and their areal extent is variable. The big boulders of phosphate float were believed to have come from collapsed limestone caves of the area. The Barili Limestone at Mainit, Camp 7, Minglanilla and the Bunga, Toledo Limestone areas were investigated. Except the Mainit caves, the rest of the area studied in Central Cebu contains phosphate deposits of not much economic importance. The phosphate rock in Cebu Island fall under four oretypes:1) granularsandy,2) oolitic-massive, 3) nodular, and 4) phosphatic clay. The total possible reserve of the island averaging above 20% P2O5 is more than 40,000 metric tons. A greater reserve between 10% and 20% P2O5 is noted.

 

ARGAÑO, W. P., 1979, Geological investigation of three Placer claims applied for lease in Bo. Akle, San Rafael, Bulacan, MGB Internal Report: BL-1881, 12 pp.

Industrial Mineral Deposits;

            The field investigation positively proved that the mineral claims applied for mining leases contained commercial amount of white clay deposits as shown in the above tabulated results of fusion tests made on clay samples previously collected in the same area.  In view of the above findings it is highly recommended that the above mentioned application for lease of the respective mining claims be favorably considered.

 

BALLESTEROS, B. C., 1975, Progress report on the delineation and sampling of aluminous laterite in Samar island., MGB Internal Report: PROG-64, 2 pp.

Metallic Mineral Deposits;

            As shown by the just concluded fieldwork, the boundary of the potential area may then be altered to exclude grounds delineated and found as non-potential, not to include , however, Dongon, pending assay results on the six samples submitted for analyses.

 

BALLESTEROS, B. C., 1976, Verification of chromite and bauxite mineralization of eight lode claims situated in Giporlos, Eastern Samar, MGB Internal Report: SA-1610, 6 pp.

Metallic Mineral Deposits;

            The area investigated is not within the proposed bauxite reservation.  Although considerable red clay exists adjacent to it, the composition, however, is probably more nickeliferous being the dominant weathering product of ultramafic rocks.

 

BASCO, D. M., 1953, A report on the sulphur deposits in Northern Sorsogon, Barrio Rizal Sorsogon August 1953, MGB Internal Report: SO-115, 5 pp.

Industrial Mineral Deposits;Geothermal Energy

            The relatively small aggregate tonnage of sulphur that may be recovered from the clay deposits in widely separated area, the expense of extraction, rugged relief and elevation, the necessity of constructing and maintaining a road 8 to 10 km to the national highway, and the geology combined to make the deposits economically worthwhile for the present.

 

BAURA, C. A., 1980, Progress report on the survey and bulk sampling of red-burning clays in Infanta, General Nakar and Real, Quezon, MGB Internal Report: PROG-187, 7 pp.

Exploration Geochemistry;Industrial Mineral Deposits

            The establishment of a brick making plant in this part of Quezon Province is to be a major step in the utilization of clay as a building material as part of the Ministry of Human Settlements projects.  This is in preparation for the planned further development of Lungsod Silangan.  A total of 13 half-sack samples were collected in the area surveyed.    If the proposed brick plant is to be established in Infanta, red clay deposits along the Marcos Highway are recommended for extraction since they are accessible within the prescribed 50-km radius from the proposed plant.  The clay in this area can be extracted without damaging food crops and properties since the area is not cultivated.  Total estimated geologic reserve is about 8 million cubic meters based on 13 exposures averaging one meter thick and 800 Ha. covered.  A detailed study of the area is recommended so as to obtain more reliable data on the characteristics of the two types of clay and positive estimates of their reserves.

 

BAURA, C. A., 1981, Memorandum report on the reconnaisnance geologic survey and bulk sampling of clay deposits in Zamboanga del Sur, MGB Internal Report: Papers Presented in the 1981 Geology Seminar, 1-12 pp.

Exploration Geochemistry;Industrial Mineral Deposits

            Based on the result of water of plasticity and PCE tests, the samples which fired into shades of brown to black and with PCE below Cone 15 may be used in the manufacture of red bricks. Clays of this type are generally extensive with ranging from yellow to red, depending on the amount or iron oxide present. If the proposed brick plant is established in Zamboanga City, the Sapa manok area is recommended for its source of red clay. The area is about 45 to 50 kilometers from the city proper. But the Bunguiao, Victoria and Zambales Base Metal areas are nearest sources for this purpose. Detailed exploratory work should be conducted in the areas mentioned so as to determine their minable reserves. Samples collected should be subjected to actual use tests aside from the physical tests.This tests will yield their actual behaviour in their manufacture. The bricks produced should also be subjected to other physical tests to determine properties like compressional strength, porosity, etc.

 

BAUTISTA, E. N., PASILIAO, E. V., et al., 1962, Preliminary ceramic tests on clay from Bondolan, San Dionisio, Iloilo, MGB Internal Report: RI-37, 1-19 pp.

Industrial Mineral Deposits;Mineralogy

            Chemical analysis of the black clay indicated the presence of 5.92% carbon and 4.63% iron, while that of the gray clay gave 0.40% carbon and 2.83% iron.  Preliminary firing test on the black and gray clays indicated a pyrometric cone equivalent of 23 and 29, respectively.  The fired color of the former was dark brown and that of the latter, grayish-brown.

 

BEDIA, E. L., CALZADA, C. V., et al., 1982, Mineralogical Study of Halloysite from Talakag, Bukidnon, Philippines, Journal of the Geological Society of the Philippines, 36, 16 pp.

Mineralogy;

            Clay sample gathered from the minesite of Bo. Ticala-an, Talakag, Bukidnon was investigated using X-ray diffraction, infrared analysis, thermal analysis, scanning electron microscopy, optical microscopy and chemical analysis.

 

BELANDRES, C., 1955, Memorandum report on the clay deposit at Balaybay Castillejos, Zambales, MGB Internal Report: ZB-276, 2 pp.

Industrial Mineral Deposits;

            Work is still in progress for the various physical, ceramic and chemical tests on all three of these clays and the results will be discussed in the final report.