Prospecting On Blinded Ore Bodies In The Deep And Outer Of Ermi Copper Deposit In Tonghua Area, Jilin Province

Ermi copper deposit subordinate to Tonghua county, Jilin province, it is located northwest about 15km to Tonghua city, geographical coordinate is E:125°49′00″, N: 41°50′55″, the whole area is 75km2. Ermi copper deposit has had a 40 year history of copper mining since liberation. Up to the Mid-1990s, the predictive basic reserves had been stopped out, and the mine was off production in 1995. With the further process of reform and opening up and mine systems'progressive adjustment, with the aim of restoring mine production and benifiting the economy in this area, and the further controlling and ascertainment to the source in and out the mine, including Institute of Geologic Investigation of Jilin Province, many Prospecting Units has carried out geological and geophysical and geophysical exploration successively since 1995, and obtained a lot of geologic clues for prospecting.The mining area is controlled by San-yuan-pu volcanic faulted basin, J3～K1 volcanic and subvolcanic rocks are special development in the region. Deposit distribution controlles by the edifice, as the convergence between the WE and NS trend fractures. Mineralization is closely relative to subvolcanic rocks, and subordinated to a part of magmatism. The deposit distribute in internal or external Volcanic apparatus in Ermi-Songdingshan is controlled by EW, NW and NEtrend fractrues, and its site like a ellipse which distribution direction is general EW, and was filled with multiple subvolcanic rocks. Around the Volcanic apparatus, there are volcanic stratas from young to old in turn, it shows that the volcanic structure was formed in late jurassic to early cretaceous. Annular and radial fractures controlled by Volcanic apparatus is special development, and these fractures controlled water system's distribution. Annular fractures can divide into the exterior, the central, and the inner from outer to inner. Most of orebody in Ermi copper deposit distribute at the intersection between partradial fractures and the inner part.As smallstock, the subvolcanic rocks including the fine quartz-diorite, middle granule quartz diorite, granite-porphyry are related to copper mineralization. The fine quartz-diorite outcropped around Songdingshan series, it's the first formed subvolcanic rocks. The later magma intrusion damaged this rock mass, made it no entirely. The choritization intense, common rock star counts a shape pyrite-rization, brass mineralizes. The middle granule quartz diorite composes the loose top mountain array main body form, the element is with fine-grained quartz diorite intrusive contact relation, the population trend is that NW covers an area of about 9km2 to exhibition cloth. The rock uses intense thin tough silk mica-rization, silication, pyrite-rization eclipse become a characteristic. Spend post the porphyry assumes small rock plant in quartz diorite body east broadside headquarter memorial artificial satellite shape half annularity distribution, the pulse shape outputs. The form assumes the tube shape, hyacinth bean shape, post shape and pulse shape very irregular, many, emersion area is 0.01-0.4km2 less, much, the bigger porphyry body (>0.01km2) has eight. Rock alteration has intense, main choritization, kaolin-rization, silication, pyrite-rization, brass mineralization waits. Towanite waits for the metal sulphide to assume the dip dyeing shape scattering among rock, contents are more, ore body reaching the industry grade but forming the dip dyeing shape. Spend post the porphyry assumes annularity scattering, have and shallow Cheng-surpassing the characteristic that the hypabyssal rock looks at and appraises, the crater explaining that formation of small porphyry rock plant accepts parasitism spending post controls, belongs to the part relaxing to be equivalent to mountain host volcano organization.Contrast to other rocks and ores, copper mine stone has very high battery charging rate, the very low resistivity characteristic, is that the law applying an electricity directly looks for an ore to have provided the physics premise.Mining area is located in abnormal northwest of HS-5 number 1/20 ten thousand river system deposit side, many elements being to give first place to Cu, Au close set abnormally, abnormal area about 199 km2. Mining area soil measurement scatters extraordinarily muchly in east mining area, southeast mining area, south mining area, all sides decoration on top mining area, the diorite gets in touch with as well as assuming annularity scattering along quartz in body the, porphyry rock emersion location spending post is same as basically on space. Enclose out more than 20 anomaly together whose to the north of long axis direction east, north west face give first place to, thing, the north and south to taking second place, ore body location and their direction is identical with the known number each other.Look for a sign an ore and look for a model an ore synthetically by the fact that all above studies two close copper mine working, being summed up as and summing up out are synthetical. Geology looks for a model an ore: Spend post the porphyry taking one's place is controlled by loose top mountain volcano organization, assume the small rock plant shape being located in parasitism of host crater on every side crater middle right away, the porphyry takes one's place as a whole along volcano organization inner ring memorial annularity distribution, ready-made ore effect of copper mine with spending post going hand in hand. Spend post the dip dyeing shape brass mineralization developing in the porphyry rock inside of makes the entire rock become the industry ore body thereby, ore body forming the so-called "dip dyeing body ", the pulse shape copper mine body assumes annularity scattering in spending post around the porphyry, or have on be sure to spend post the porphyry scatters, has demonstrated the characteristic that structure controls now that the porphyry controls, accepts quartz diorite contact zones by the flower; Electricity law looks for a model an ore: Copper mine stone is hit by battery charging rate most highly in area inner rock of all kinds ore, resistivity is lowest, difference is very notable with surronding rock electricity sex, make use of arousing polarization law being able to carry out a forecast effectively; The abfarad looks for a model an ore: -- known number mining area shoulders field or is area lower than mostly in terrestrial magnetism, be smaller than 500nT like Z, whose form and the quartz diorite body border fit each other. Charge ore structure since contact zones structure is that this mining area is main, terrestrial magnetism shoulders field or is area fit with contact zones structure lower than, for this mining area provide look for the terrestrial magnetism model an ore; The geochemistry looks for a model an ore: Abnormal directionality of soil measurement Cu element is obvious, assume the section of an area that the tape exhibition spreads, sometimes forebode existence having the pulse shape copper mine body; But directionality does not assume the section of an area that the round shape, shape distribute extraordinarily obviously, then forebode have dip dyeing shape brass mineralization to spend post the porphyry existence.Predict and classification of the prospect target was carried on, based on the established of synthesis exploration information and indicator. ThreeⅠgrade prospect target and twoⅡg rade prospect target was defined, and also prospecting Cu,Au,Mo mine and next working area was determined.