Yunnan Mine Tour (Baoshan Dalingzi Gold Mine)

The Saige Dalingzi gold deposit in Lujiang Town, Longyang District, Baoshan includes Dalingzi, Danggang, Dahengpo and Dapingzi. The total mining area is 34.78 square kilometers.

The gold ore bodies are layered and lenticular, and are controlled by ductile shear zones and strata. The ore-bearing rocks are biotite quartz schist, biotite quartz schist and diorite tremolite. The surface and shallow parts are oxidized minerals, the middle and deep parts are mainly primary minerals, and some are mixed minerals. The average gold grade of the ore body is 65438 0.80g/ton, and the coefficient of grade variation is 89.3%. It belongs to an ore body with uniform composition distribution.

Lujiang Town is located at the end of Nujiang Grand Canyon between Nushan Mountain and Gaoligongshan Mountain. It is connected to Pupiao Town in Longyang District and Bai and Yi Township in Liu Yang in the east, Wuhe Township, Mangbang Town and Qushi Town in Tengchong City in the west, Zhen 'an Town and Ramon Township in Longling County in the south, and Mangkuan Dai Township in Longyang District in the north. The total land area is 734.30080808076, with abundant sunshine and rainfall throughout the year. The annual average temperature is 265438±0.3C, the absolute maximum temperature is 40.4℃, and the absolute minimum temperature is 0.2℃.

Lujiang Town, located in Gaoligongshan Tourist Resort, is an ancient Dai "Menghe/Meng He" with a total population of 80,599 (20 18). Jurisdiction over 27 administrative villages and 3 state-owned farms. It is a famous tourist town in Yunnan Province and one of the beautiful livable towns announced by the Ministry of Housing and Urban-Rural Development of China.

In April, when plants were sprouting in full of green, we came here and stood on this land rich in gold. With the footsteps of Miss Chun Shanshan, the warm spring breeze blows here, and thousands of wild flowers are in full bloom on the grassy hillside. White, pink, crimson, delicate and charming, fragrant, and brilliant wild flowers all over the mountains make Gaoligong Mountain look particularly enchanting and beautiful. At this time, the Woods in Lujiang Town are lush with green grass, and the kapok branches are covered with colorful butterflies. Looking around, it is an endless ocean of flowers, and the rich fragrance permeates your heart and spleen and slowly penetrates into your soul. This is a grand ceremony of spring blooming, playing the music of spring. In the early morning, the forest is full of fog, and the distant mountains with faint deep blue are hidden from time to time, just like Penglai fairyland. Shaded bushes are scattered on the hillside, and seeing flowers in the fog adds charm. When the first ray of sunshine fell on the hillside, the whole forest in Shan Ye seemed to suddenly wake up from a dream. The golden sunshine is like a magic brush, and layers of hillsides are outlined with curved Phnom Penh.

The geotectonic position of Saige Dalingzi Gold Mine is located in Gangdise-Nyainqentanglha fold system, Boshuling-Gaoligongshan fold belt, the northern section of Lushui-Longchuan fold bundle and the west side of Nujiang fault.

From the old to the new, there are schists, marble mixed with biotite plagioclase granulites and tremolite in the Mesoproterozoic Gaoligongshan Group, and the main ore bodies in the mining area occur in the second sub-rock member of the group. Shale, banded argillaceous limestone and slate of Baoshan Formation of Upper Cambrian are intercalated with isochronous sandstone and phyllite; Upper Carboniferous Dingjiazhai Formation shale intercalated with sandstone; Basalt of Woniusi Formation of Upper Carboniferous is mixed with limestone and shale lens; Middle Triassic dolomite of Wanhejie Formation.

The fold is anticlinorium of Gaoligongshan, the core stratum is metamorphic rock of Gaoligongshan Group, and the wing stratum is Cambrian and Carboniferous. Due to the influence of faults and magma intrusion, the shape is incomplete. The mining area is characterized by an inverted anticline, and the strata are not completely exposed.

Fault structures are mainly divided into two groups: nearly north-south direction and northwest direction. The faults in the nearly north-south direction group have the characteristics of multi-stage and multi-level deformation.

Walking to Dalingzi, I began to hear the cheerful cries of cattle and sheep in the distance. The villagers' wooden houses also raised the smoke from the kitchen, stepping on the grass on the hillside, and the dew kept falling on their feet, as if hearing the squeak of golden sunlight penetrating the soil. Roll on the ground and smell the fragrance of grass and earth. The world in Taoyuan is so beautiful.

The gold mineralization belt is distributed in the west of the central mining area, with a bandwidth greater than 185.57m and a control length greater than1400 m. It is composed of three parallel ore bodies, V 1 and V2 and V3, which are slightly arc-shaped and have a large arc distribution. Generally, the mineralized zone is north-south, inclining to the east, and the dip angle is relatively gentle, generally 65438+04. The top of the mineralization zone is marble containing tremolite sericite; The bottom is the second layer of ductile shear zone with a thickness of 60m ~ 120m. Its lithology is biotite plagioclase granulite, diopside, diopside granulite mixed with mica schist, sericite schist and a small amount of marble.

Compressive schist is developed in this mineralization zone, and the contact zone between biotite schist and tremolite-containing marble is the ore-bearing part of gold mineralization body. After trench exploration and drilling, three gold ore bodies are identified, and the gold grade is generally between 0.5 and 6.65 g/t.

Walking in Jinshan Linhai Garden in the breeze of spring breeze, the blooming kapok is like a crimson light cloud, drifting endlessly in the rolling mountains. Vibrant wild flowers are flying all over the sky like elves. People dance with them, kiss a petal, and feel the breath of spring in Segdalingzi Gold Mine slowly seeping into the heart and spleen.

Colleague Zhang Gong picked up a stone from the ground and told us it was gold ore. Limonite has become a net, which is really different from other stones. It is said that the gold content of this ore is still very high, and it is a precious wealth endowed by nature.

The gold deposit in Dalingzi gold mining area occurs in the primary shear zone, fracture zone and footwall of the second member of Mesoproterozoic Gaoligongshan Group, and the ore body is obviously controlled by ductile shear zone, showing layered output. The ore-bearing rocks are mainly silicified, brown (yellow) iron-mineralized broken biotite quartz schist, biotite schist and diopside rock. The roof and floor rocks are rhyolite schist, marble and biotite quartz schist. The occurrence of mineralized layer is basically the same as that of surrounding rock, and most of them fluctuate gently, with obvious branching and compounding phenomena. The fold structures in the ore (mineralized) zone and its vicinity are well developed, which are influenced by multi-stage and multi-stage tectonic movements, folds and fracture zones, and strip structures and lenticular structures are developed in the mineralized zone. Gangue minerals mainly include quartz, feldspar, mica and calcite. Metal minerals mainly include (magnetic) pyrite (mostly limonite oxide), occasionally arsenopyrite and chalcopyrite. The erosion of surrounding rocks is mainly silicification, brown (yellow) iron mineralization and arsenopyrite (smelly onion) mineralization. In addition, there are secondary carbonation, chloritization and kaolinite.

There are silicification, brown (yellow) iron mineralization and chloritization (arsenopyrite) closely related to gold mineralization, and there are industrial gold ore bodies in areas where various surrounding rocks are superimposed and alteration is strong.

After seeing the gold mine, Zhang Gong gave us a brief summary:

All the ore (mineralized) layers found at present are in the oldest strata in this area, and most of them are in the second stratum of the second member of the Mesoproterozoic Gaoligongshan Group.

The ore-bearing lithology is mostly silicified, brown (yellow) iron schist, and the surrounding rocks are schist and marble. The mineral composition of ore-bearing rocks is complex.

The ore (mineralized) layer is obviously controlled by ductile shear zone, with small folds and fold structures developed and ore-bearing strata generally broken. Generally speaking, the structural belt is distributed in the north-south direction. Gold ore bodies rich in sulfide are oxidized to form iron caps, through which gold ore bodies can often be found.

According to the geological characteristics of the above deposits, it is preliminarily considered that Dalingzi gold deposit belongs to the structural altered rock type gold deposit related to medium-low temperature hydrothermal solution.

See the scenery on the way back. The flowering period of each wild flower in Gaoligong Mountain ranges from one week to one month. There are many kinds of flowers, and all kinds of wild flowers last as vigorously as relay races until mid-June.

When we came to Lujiang Town now, the wildflowers that had bloomed early had just begun to fall, and a night breeze was blowing, and the petals were falling from the top of the head. I remember someone said that the fallen flower is a poem falling with the wind, full of spirituality.

Baoshan Lujiang Town has a unique geographical location, with Gaoligong Mountain in the west, Nujiang River in the east, high in the west and low in the east. It is the second largest canyon in the world, and its natural barrier makes it a dry-hot valley climate zone. The small coffee produced in the Grand Canyon is of high quality, characterized by "strong but not bitter, fragrant but not strong, with a little fruity taste". 1993 At the 42nd Eureka Expo in Brussels, Baoshan Cafe conquered the taste buds of almost demanding coffee tasters in one fell swoop, won back the Eureka Gold Award, and since then it has been fragrant on five continents.

The river of Dalingzi in Lujiang Town and the mountains in the distance are hidden among the flowers, and the big wild flowers are covered with branches like butterflies. Among the flowers, cattle and sheep graze quietly under the flowers, and the girls' silvery laughter echoes in the valley. This is a beautiful place full of rural scenery. "Thousands of fragrant flowers lean against trees, and a little cloud; Judging from your tireless wind, it is this flower that accounts for spring. " Walking among the kapok trees in Dalingzi Gold Mine, I put my ear close to a flower, as if I heard the cheerful beating heart rhythm, which was the most beautiful sound this spring.