rock chip | ScienceGate

Pulau Flores merupakan salah satu pulau di Indonesia yang kaya akan potensi bahan tambang termasuk emas. Secara umum, potensi pertambangan di Pulau Flores cukup besar yang meliputi berbagai jenis galian Golongan A, B dan C. Untuk jenis galian Golongan A (emas), baru merupakan perkiraan karena belum dilakukan penelitian secara seksama. Tujuan penelitian ini adalah mengutahui potensi endapan emas yang berasosiasi dengan struktur geologi. Metode yang digunakan berupa orientasi litologi dan struktur geologi, analisis XRF (X - Ray Fluoroscence) dari sampel RC (Rock Chip) dan SS (Stream Sediment). Hasil pemrosesan data geokimia batuan dari data XRF terdiri dari unsur utama, unsur jejak, dan unsur tanah jarang memperlihatkan prospek mineral logam yang relatif kecil dengan mineral Au yang berkisar antara <0,005-0.011 ppm, yang cukup jauh dari nilai cut off grade Au. Sedangkan dari hasil orientasi litologi dan struktur geologi diduga model mineralisasinya adalah tipe epithermal vein system. Sistem ini dikontrol oleh struktur patahan dan kekar.

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Preliminary studies of gold deposits and a reconnaissance rock chip sampling program, Al Khaymah region, Aban al Ahmar Quadrangle, Kingdom of Saudi Arabia

Open-File Report ◽

10.3133/ofr85354 ◽

1986 ◽

Author(s):

C.W. Smith ◽

R.M. Samater ◽

J.C. Cole

Keyword(s):

Saudi Arabia ◽

Gold Deposits ◽

Kingdom Of Saudi Arabia ◽

Sampling Program ◽

Rock Chip

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Numerical Study on Process of Breaking Rock with TBM Cutter in Different Cutting Orders

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.34-35.1583 ◽

2010 ◽

Vol 34-35 ◽

pp. 1583-1586

Author(s):

Ji Qiu Tan ◽

Qing Tan ◽

Yi Min Xia ◽

Zi Jun Xu ◽

Xi Long Qu

Keyword(s):

Numerical Study ◽

Simulation Models ◽

Rock Breaking ◽

Whole Process ◽

Stress Contour ◽

Breaking Mechanism ◽

Rock Chip ◽

Loading Modes ◽

Tbm Cutter ◽

Future Work

In order to research the effect of different cutting orders on breaking mechanism of TBM cutters for the rock without joints, this paper established the simulation models of breaking rock three TBM cutters in simultaneous and sequential orders, which is based on the 2D discrete element method. A series of numerical experiments were designed and the whole process of production and propagation of crack and rock breaking was successfully simulated. The simulation results showed that the cutter order determines the breaking mode, which is carefully analyzed: The chipping stress under the sequential order is higher than simultaneous way. The chips are formed by the side cracks under the two loading modes, while the shape of the rock chip are different. The distribution of the principal stress contour is almost symmetrical in different cutting order. Finally, conclusions and future work are summarized.

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Identificación de las Mineralizaciones de Cobre Aflorantes en el Corregimiento de San José de Oriente, La Paz, Cesar

INGENIARE ◽

10.18041/1909-2458/ingeniare.18.545 ◽

2015 ◽

pp. 115

Author(s):

Karol Cardeño Villegas ◽

Elías Ernesto Rojas Martínez ◽

Dino Carmelo Manco Jaraba ◽

Rony Rafael Cárdenas López

Keyword(s):

San Jose ◽

La Paz ◽

Rock Chip ◽

Para Determinar

Al suroeste del corregimiento de San José de Oriente, en el sector conocido como La Lagunita, municipio de La Paz, departamento del Cesar, se realizaron estudios exploratorios de geología superficial en la formación La Quinta, permitiendo identificar afloramientosde las zonas mineralizadas y unidades litoestratigráficas presentes en la área. Se tomaron cuatro muestras entre la zona de contacto, roca, caja y mineral, mediante el método Rock Chip, de las cuales se envió una a análisis cualitativo mediante el estudio de difracción de rayos X y otra a un análisis cuantitativo mediante absorción atómica en los laboratorios de la Universidad Industrial de Santander, para determinar minerales asociados y el porcentaje de cobre presente en las manifestaciones.A partir de los resultados obtenidos con el análisis de difracción de rayos X, se identificaron los minerales constituyentes de las rocas tales como: Cuarzo SiO2, Albita Na(AlSi3O8), Clinocloro (Mg, Fe, Al)6 ((OH)8 (AL, Si)4 O10), Hematita Fe2O3, Ortoclasa KAl- Si3O8, Illita (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)], Glagolevita NaMg6[Si3AlO10](OH,O)8H2O, Malaquita (CuOH)2CO3 y mediante los resultados de absorción atómica se logró verificar la alta concentración de cobre-Cu de 1,45 %.

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Characteristics of rock-chip geochemical anomalies of No. 460 gold deposits in Gansu Province, China

Mineral Deposit Research: Meeting the Global Challenge ◽

10.1007/3-540-27946-6_388 ◽

2005 ◽

pp. 1523-1526

Author(s):

Wei-Xuan Fang ◽

Zhuan-Ying Huang ◽

Bin Zhou ◽

Yun-Bing Nong ◽

Tian-You Zheng

Keyword(s):

Gold Deposits ◽

Gansu Province ◽

Geochemical Anomalies ◽

Rock Chip

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PROSPECTS OF NEWLY DISCOVERED UGUR AREA IN THE NORTHWEST OF THE GEDABEY ORE DISTRICT (LESSER CAUCASUS, AZERBAIJAN)

Visnyk of Taras Shevchenko National University of Kyiv Geology ◽

10.17721/1728-2713.93.06 ◽

2021 ◽

pp. 53-63

Author(s):

N. Imamverdiyev ◽

V. Baba-zadeh ◽

S. Mursalov ◽

A. Valiyev ◽

M. Mansurov ◽

...

Keyword(s):

Gold Mineralization ◽

Gold Silver ◽

Rock Chip ◽

Hydrous Ferric Oxides ◽

Lesser Caucasus ◽

Exploration Area ◽

Drill Holes ◽

Positive Results ◽

East West ◽

Ore District

The article describes Ugur exploration area located in Gedabey Ore District of the Lesser Caucasus in NW of Azerbaijan. Results of trenches and channels sampling on the surface, RC bore holes and summary of significant drill intercepts (>0.29 ppm Au) of Ugur Exploration area are presented. It has been established that The deposit is enlarged by highly gold-silver result of surface outcrop rock chip samples over an area of 2.5 kms North-South by 2 kms East-West, with the Reza gold deposit located in the central part. Out of metallic minerals crystalline hematite was observed. On surface intensive barite and barite-hematite vein and veinlets, also gossan zones were observed. The main mineralization zones have been sampled in three trenches at a distance up to 270 m by trenches #1, #2 and #3 and received positive results for gold and silver. Also there have taken approximately 550 samples from outcrop #1 and #2. On the main orebody at surface centre there occured secondary quartzites with vein-veinlets barite-hematite mineralization over which there remain accumulations of hydrous ferric oxides cementing breccias of quartz and quartzites. And in erosion parts "reddish mass" being oxidation product of stock and stockverk hematite ores were observed. Representing typical gossans, these accumulations by the data of trenches for thickness about 5-10 m contain gold 0.3-2.0 ppm and silver 1.0-15.0 ppm. Ten diamond drill holes, named UGDD 01-10 were drilled in the center part of the deposit. The drill holes were sampled mainly in 1 meter lengths from the top of the hole to the bottom. The core samples were marked and placed into standard boxes. Significant intervals of weighted averages greater than 0.29 ppm over down hole intervals of 1 metres or greater (>0.29 ppm Au and >0.9 m) are summarized in table 3 below. In conclusion, the outcropping alteration at the deposit is typical of the upper steam-heated levels of high-sulfidation epithermal (HSE) deposits, which in most mineralized systems of this type, may cap higher-grade gold mineralization which is hosted by underlying vuggy and oxide zones.

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