Detailed investigation of the No. Ⅱ mine section of Jiangfeng Iron Mine, Jinghong City, Yunnan Province

(1) Overview

The exploration area is located at a distance of 59 kilometers in the 195° direction of Jinghong City. The administrative division belongs to Menglong Town (Dongfeng Farm No. 6), Jinghong City, Xishuangbanna Dai Autonomous Prefecture. branch). The exploration area has convenient transportation. There is a simple highway connected to Menglong Town. The highway mileage from the exploration area to Menglong Town is 5 kilometers, the highway mileage to Jinghong City is 65 kilometers, the highway mileage to Kunming is 655 kilometers, and the highway mileage from Jinghong to Kunming is The highway has been completely connected, and the highway mileage from the mining area through Jinghong and Yuanjiang to Yuxi Yanhe Railway Station is about 545 kilometers. This area has a tropical humid monsoon climate, and the higher mountainous areas on the edge have a subtropical climate, with long summer and no winter, small temperature difference among the four seasons, sufficient sunshine, calm winds and little cold, and distinct dry and wet seasons.

From August 2012 to December 2013, Team 306 of the Yunnan Provincial Nonferrous Geology Bureau carried out exploration work. The exploration mineral was magnetite, and the work level was detailed investigation. The total investment in exploration funds was 13 million. Yuan.

(2) Brief description of the results

The genetic type of the Jiangfeng iron ore deposit belongs to the marine basic volcanic eruption-sedimentary-metamorphic magnetite deposit, and there are currently 6 delineated ones The magnetite body is produced in the skarn of the second and third layers of the metamorphic rock series in the lower section of the Damenglong Group. It is layered, with branching and compounding, pinching out and reappearance, expansion and contraction. The occurrence of the ore body is similar to The stratigraphic occurrence is basically the same. Spatially, from top to bottom, they are I3, II1, II2, II3, II4, and IV1, with inclinations of 108° to 152°, inclination angles of 64° to 89°, and average inclination angles of 83°, which is close to parallel output. The strike length of the six ore bodies is 200 to 991 meters; the maximum inclined extension depth is 773 meters, the ore elevation is 723 meters to -393 meters, and the maximum vertical height is 948 meters; the thickness of a single ore body is 1.00 to 71.57 meters, and the average thickness is 3.23 to 24.01 meters; The grade of a single ore body is TFe20.31%~55.61%, and the average grade is TFe24.27%~34.47%; the grade of a single ore body is mFe12.30%~43.18%, and the average grade is mFe14.18%~26.30%. The thickness of the ore body is relatively stable and the grade distribution is even. II3 is the largest ore body in the mining area. Ore TFe (total iron) 15.02% ~ 63.82%, average 31.09%; mFe (magnetic iron) <0.30% ~ 62.82%, average 23.87%; SFe (soluble iron) 11.51% ~ 60.93%, average 34.90%; harmful group Some parts exceeded the standard. The metallic minerals are mainly magnetite, followed by pyrite, with a small amount of chalcopyrite and pyrrhotite. The natural type of ore is massive and disseminated diopside skarn type magnetite, and the industrial type is iron ore (lean ore) that needs to be selected.

As of November 30, 2013, the amount of (111b+122b+333) ores identified in the mining rights is 134 million tons, with TFe31.64% and mFe23.32%; among which (111b) ores The volume of (122b) ores was 29 million tons, the (111b+122b) ores were 41 million tons, accounting for 30.84%, and the (333) ores were 93 million tons. The amount of resources discovered so far has not been reviewed.

(3) Brief process of achieving results

From August 2012 to December 2013, Team 306 of the Yunnan Provincial Nonferrous Geology Bureau carried out production exploration of the entire mining area. In November 2013 Field drilling construction was completed in May.