Chul-Ho Heo

Pb and Zn in Peru: Supply trend and resource amounts

Jorge Acosta Ale, Alexander Santisteban, Dina Huanacuni, Seok-Jun Yang and Chul-Ho Heo* Dirección De Recursos Minerales Y Energéticos, Instituto Geológico Minero y Metalúrgico, Peru Convergence Research Center for Development of Mineral Resources, Daejeon 34132, Korea Mineral Resources Department, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea Department of Mineral and Groundwater Resources, University of Science and Technology(UST), Daejeon 34113, Korea (Received: 26 February 2016 / Accepted: 18 March 2016)

Gold in Peru: Present Status and Future Challenge

Total reported gold resources in Peru is about 192 Moz. Gold production in Peru was 4.9 Moz in 2013, which was ranked first in Latin America and sixth in the world. Historic cumulative gold production in Peru is 118 Moz, and production from main gold belts including Miocene epithermal belt, Carboniferous-Permian orogenic gold belt and Upper Cretaceous intrusion-related gold belt corresponds to 84%. Most of production areas are located in Northern part of Peru, which corresponds to 63.5% of the total domestic production. Annual production onces in Yanacocha mine and Alto Chicama were 1 Moz and 0.606 Moz in 2013, which were ranked first and second in Peru, respectively. Gold production in Peru is expected to be 6.5 Moz in 2017. To accomplish the expected production, ongoing 14 projects should be developed to the production stage in three years.

Distribution of Fe-Mn Ore in Ugii Nuur, Mongolia Using Magnetic Data

Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources,Daejeon 305-350, KoreaAbstract: Korea Institute of Geoscience and Mineral Resources (KIGAM) and Mineral Resources Authority of Mongolia(MRAM) performed a joint survey on Ugii Nuur Fe-Mn mineralized area. Following the survey, we carried out magneticsurvey and 3D magnetic susceptibility inversion. Based on the inversion results, basic feasibility study and 3D imaging ofFe-Mn mineralized area were performed using 3D geological modeling technique. Using the distribution of total magneticfield data, we were confirmed for the possibility of horizontal extension of ore bodies from surface outcrops. The 3Dmagnetic susceptibility model, which is highly related with Fe content, analyzed by inversion shows that the ore bodies ofDeposit 1 and Deposit 2 are extended to the underground and ore bodies that are not exposed on the surface are largelydistributed in the underground. If we perform the integration analysis using this magnetic susceptibility model and the oregrade data analyzed by drilling survey, it is possible to carry out the effective potential evaluation of Ugii Nuur Fe-Mnore deposit.Keywords: Ugii Nuur Fe-Mn Ore mineralized area, magnetic survey, 3D imaging요약: 한국지질자원연구원은 몽골 광물자원청과 공동으로 우기누르 철-망간 광화대에 대한 공동 연구를 수행하였다.이의 일환으로 수행된 육상 자력탐사에서 획득한 자료를 바탕으로 3차원 자력 역산을 수행하였으며, 3차원 지질모델링기술을 이용하여 철-망간 광화대에 대한 3차원 영상화 및 광체 평가를 위한 연구를 수행하였다. 총자력 이상의 분포 특성을 통해 연구지역의 광상에서 지표 노두로부터 수평적으로 연장되는 광체의 부존 가능성을 확인하였다. 또한, Fe 함량과 상관성이 높은 자기감수율 역산 결과를 토대로 연구지역의 제 1광상 및 제 2광상 모두에서 지표에서 드러난 광체가 지하하부로 연장되어 있는 것으로 해석되어, 지표에 드러나지 않은 광체의 부존 가능성이 높은 것으로 판단된다. 시추 조사를 통해 일부 대표 지역의 광체 품위 자료가 확보되고 이번 연구결과와의 복합 해석을 수행한다면 효과적인 개발 가능성 평가가 가능할 것으로 판단된다.주요어: 우기누르 철-망간 광화대, 자력 탐사, 3차원 영상화

A Study on the Characteristics of W-Mo Ore Deposit in Bayan-Onjuul, Mongolia Using Magnetic Data

KIGAM (Korea Institute of Geoscience and Mineral Resources) and MRAM (Mineral Resources Authority of Mongolia) performed joint survey on Bayan-Onjuul W-Mo mineralized area. Following the survey, we carried out magnetic survey. W-Mo occurrences are located with keeping a certain distance from the northern boundary of granite which has higher magnetic susceptibility values. Also, the 3D imaging results of magnetic inversion show that granite bodies are extended to the W-Mo occurrence areas from the deep main body with decreasing of susceptibility. The results of magnetic data analysis are well matched with the general characteristics of ore solution involved with W mineralization. The further study about the hidden ore deposits which have similar spatial relationship between granite and known WMo occurrences are necessary to improve the economic feasibility.

General Geochemical Characteristics of Dashinchilen Nb-Ta and Sant Cu Occurrences in Southeastern Part of Khangai Area, Mongolia

We performed reconnaissance survey on Dashinchilen Nb-Ta REE area and Sant Cu area which are located in southeastern part of Khangai rare metals mineralized belt. In Dashinchilen area, Nb and Ta have been found in pegmatitic granite that is largely distributed in the survey area and muscovite in pegmatite which is an intrusion in paleozoic sedimentary rocks which are mostly composed of sandstone. While grades of Nb and Ta are not high, an outcrop that has high Th and U contents (542 ppm of Th and 56.9 ppm of U) has been found. Average and maximum REE contents in the survey area is three times and seven times, respectively, larger than average REE contents in the crust of the Earth. In Sant area, copper oxides such as malachite has been found in quartzite in paleozoic sedimentary rocks. A sedimentary rock formation that has high grade of Mn (12.4-34.6 %) has been found in the survey area. This sedimentary rock formation is the same formation with that of Ugii Nuur Fe-Mn mineralization which is located about 200 km northwest of the survey area. Average and maximum REE contents in the survey area is two and half times and seven times, respectively, larger than average REE contents in the crust of the Earth. According to the factor analysis for the data of the geochemical analysis, Nb and Ta in Dashinchilen area are highly correlated with muscovite and Cu in Sant area is highly correlated with Mo, Sn, and Bi. Furthermore, the factor analysis results show that Fe in Sant area was deposited with rare earth elements.