| Jiama Polymetallic Copper Deposit located in MoZhugongka county ,Tibet ,tectonic position belonging to Ladakh-Gangdise arc basin system ,Ladakh-South Gangdise arc basin system-XiChaYu magmatic arc , is a skarn-porphyry copper-polymetallic deposit. Ore bodies have been found in three types of mineralization,including skarn orebodies production in Contact zone and the periphery of K1l and J3d,o re bodies being bedded,parabedded,main mineral being bornite,chalcopyrite,etc;Hydrothermal orebodies production in hornfels of K1l,ore bodies being lenticular,vein type, main mineral being chalcopyrite,molybdenite;Porphyry-type orebodies in the deep of Mining,main mineral being molybdenite.Wall-rock alteration is very strong,including skarnization,silicification,sericite,hornfels and so on.It is very close between the geophysical exploration,geochemical explo ration,remote Sensing anomalies and mineralization. In the geophysical,anomalies that magnetic contours(ΔT)are very dense is more consistent with alteration,mineralization and granitic porphyry,being favorable for prospecting;In the geochemistry,abnormal element is mainly Au,Ag,Cu,Pb,Zn,Mo,etc.Anomaly patterns are very simple.Abnormal strength and size is relatively large.Enrichment trend of anomalies is obvious clear.Anomalies are more consistent with deposit and deposits of different elements. In remote sensing,hydroxyl anomalies and ferric contamination anomaly are consistent with the strong silicified hornfels,caused by the buried porphyry rock bodies,having close relations with the mineralization.Based on study of a typical deposit,this article extracts ore-forming elements and elements on the prediction in the area,establishing a mineralization factor map and a forecast factor map in the area and summarizes metallogenic regularity. The paper used the model of Geological Unit Comprehensive Information,extracted the element of the fixed forecasting area by getting its unions and intersections,then supplemented by artificial calibration and finally formed 4 minimum forecasting area.Selecting the geological volume method,we calculated in the geological forecast system and obtained result of the total amount of resources in the forecast area,4341400 tons,which of resources had been identified is 844800 tons and which of forecast resources is 3496600 tons.We also made the prediction of resources of associated mineral. Forecast resources of molybdenum are 126600 tons,the total resource of 144600 tons;Forecast resources of lead are 877000 tons,the total resource of 4723000 tons;Forecast resources of zinc are 363300 tons,the total resource of 144600 tons;Forecast resources of gold are 77.583 tons,the total resource of 100.943 tons;Forecast resources of silver are 5362.8 tons,the total resource of 6977.494 tons. |
