Yunnan Mine Tour (Heqing Beiya Gold Mine-1)

Beiya Gold Mine is located in Beiya, Heqing County, Dali Prefecture, northwest Yunnan, about 62 kilometers away from Heqing County and 98 kilometers away from Dali City. Dali-Lijiang Highway and Dengchuan-Heqing Highway pass through the mining area, with sufficient water and electricity, and production mines have been built.

Driving route: Dali → Beiya, Heqing County, the whole journey is about 98.0 kilometers.

Starting point: Dali City

1. Start from due south, drive 10 meters, and turn right into Cangshan Road.

2. Drive along Cangshan Road for 390 meters and turn right into Taian Road.

3. Drive along Tai 'an Road for 870 meters and see Tai 'an Road 1 exit.

4. Continue along Tai 'an Road 100 meters, take the second exit, and turn left into Carlsberg Avenue.

5. Drive along Carlsberg Avenue for 290 meters, pass the Bolton Hotel on the right and turn right into Renmin North Road.

6. Drive along Renmin North Road 13.9 km, cross Taoxi Bridge for about 280 meters, and go straight into Santa Tunnel.

7 Drive along Santai Tunnel for 430m and go straight into G2 14.

8. Drive along G2 14 for 34. 1km, and turn left into Dali Line.

9. Drive along Dali Line for 34.7 kilometers, pass Guanyingzhuang on the right for about 260 meters, then turn to Yabei, and turn right ahead to enter the line.

10. Follow Huang Xi Line 12. 1 km, and reach the destination (on the right side of the road).

End point: North Asia

Beiya is an important deposit with superior metallogenic conditions and good prospecting prospects, which can greatly increase mine reserves. The types of ore deposits and metallogenic geological environment are representative in western Yunnan, which has always been concerned by geological prospecting departments and geologists. In recent years, the mine has been explored by Yunnan Geology and Mineral Resources Co., Ltd. for many times, and its gold reserves have reached a super-large scale, with good development and production benefits, ranking among the world-class giant gold deposits. In addition to gold, Beiya mining area has also proved silver reserves of more than 1 10,000 tons, which is a world-class giant deposit.

In the midsummer of June, I entered the dog days in the heat. When the Yi Torch Festival was ushered in Chuxiong, Yunnan, we came to Beiya Village, Heqing County and looked at the golden mountain in the fog. It is planned to start from Beiya Village, take a bus on the main road, hike on the path, climb the mountain when encountering the mountain, and go to Wandongshan to see an open-pit mining field passing through Xiaomi field; Then look at the vein along the iron mine pond, mast slope and Bijiashan; Then look at the Quaternary residual gold deposits from Gaishan, Jingouba and Hongnitang, and finally return to Beiya Village.

Covered with morning dew, walking on a country road with stones in the red soil of Beiya village, climbing on the hillside of Xiaomi field and Wandongshan gold mining area, submerged in the misty morning fog, our party is less crazy to escape from Yunnan mines and more audio-visual exploration and decryption. Birds are singing and insects are singing, butterflies are flying, bees are flying, the grass grows and trees move, the breeze is blowing gently, the flowers in bloom are refreshing, and the dew drops into the red soil. Everything is so natural, so fresh, so refreshing and so harmonious. As soon as I got to the mine, the mountain opened, and one after another, mine cars, concentrator, cyanide treatment plant and gold mine piled up for leaching ... I couldn't help sighing again: this is a magical land with scars all over the mountains and gold staining human dust. This is a unique and mixed golden world. This is a piece of red soil, and it is also an exciting picture of Jinshan Yinshan. This is a heap leaching field, where stones can be turned into gold.

Entering Wandongshan mining area, the length from north to south is 1.8km, and the width from east to west is 1.3km, with an area of 2.34km2 ..

Wandongshan ore block is located in the overlapping part of the south-north Qiping-Beiya structure-porphyry metallogenic belt, the east-west structural belt and the northwest structure, and is the structural node of metallogenic structure-magmatic network structure. Porphyry is a compound rock mass, and syenite porphyry is the product of collision diagenetic structural environment with granite characteristics. The syenite monzoporphyry is the product of the diagenetic tectonic environment in the late orogeny-late orogeny, with medium to high heterogeneity, and biotite syenite porphyry and lamprophyre are developed. Generally, the rock mass is produced in a north-south vein, with skarnization, magnetite and ferromanganese mineralization at the edge of the rock mass, and the late structural composite superposition is obvious.

The ore block has the characteristics of multi-stage and multi-stage tectonic-magmatic-mineralization superposition. The contact fault structural zone in the east of the main rock mass in Wandongshan ore block is developed, forming a vein-fracture-mineralization zone, accompanied by porphyry vein, lamprophyre vein and limonite vein, with strong gold mineralization. The primary gold mineralization in this ore block is intense and extensive, and has certain erosivity. Paleo-weathering crust of Tertiary is well developed and well preserved, so "laterite type" gold mineralization is developed. Ten thousand tons of lateritic gold deposits have been produced in Wulipai area. The iron and gold deposits in the first western contact zone of porphyry continue to extend westward, with a minimum thickness of 5.74m and a gold content of 4.42g/ton. The thicker section is 50m thick, with gold 1 ~ 3.2g/ ton; The thickness of the ore body in the upper contact zone of the second porphyry is13.24m, and the gold is1.04g/ton. The limestone in the upper part of the west side is a short axis anticline, which is caused by the uplift of the underlying porphyry, and the uplift is in contact with the rich ore bodies. Wandongshan is the best gold deposit in Beiya mining area.

After seeing Wandongshan mining area, we went to Bijiashan Gold Mine along the iron mine pond and mast slope. Walking to the corner of the iron mine pond, accompanied by the sound of a gust of wind blowing shrubs, a folk song came over: "pomegranate flowers are red, and the intimate little sister meets again;" Although the separation time is not long, it seems that it has passed nine winters. " Then the female voice should sing: "peach blossoms are full of trees in March, and when I see my brother, it is a winter;" I miss you with my heart, just like looking forward to the breeze in the dog days. " Once upon a time, a pair of Bai youths sat on a stone, snuggling up to a pair of love songs, and a two-person motorcycle was parked next to them. All of us felt that this scene was unnecessary, so we went back, found another way to climb the mountain and take photos, and went to the fork in the road to pick up a beautiful gold ore.

Over the mountains, over the ravine ridge, we came to Bijia Mountain.

Bijiashan ore block is 65438 0.7km long from north to south, 0.4km wide from east to west, and covers an area of 0.68km2. It is located at the intersection of Qiping-Beiya north-south structural porphyry metallogenic belt and Nandaping-Mashipo east-west structural porphyry metallogenic belt, and it is the overlapping part of the northeast Wopu-Houshan syenite porphyry belt. This part is located in a strong north-south linear tectonic belt on the remote sensing image. There are two north-south tectonic stress extension zones (zones) in this area, which are distributed along the east and west sides of Bijia Mountain and the mast slope in the north-south direction. On the surface, the porphyry vein-limonite vein mineralization belt is formed by many faults corresponding to the western slope and the eastern slope of Bijiashan Mountain. The western belt extends northward and is covered by Quaternary system, while the eastern belt extends northward to Mast Slope. The porphyry veins exposed near the surface in this area are thin and sparse, which are equivalent to many groups of fault-filled veins in Beiya porphyry-fault fracture transition zone. There are alteration phenomena such as skarnization, limonitization and fading at the edge of dike, and the faults overlap obviously in the later stage. Gold mineralization is formed in vein faults.

There are three layers of ore bodies exposed in the tunnel, with ore thickness 13.5m and gold content of 2.62 ~ 9.16g/t. The ore body continues to extend deep with the porphyry. Many porphyries developed in nearly north-south faults are distributed obliquely, including shallow limonite veins and iron-gold veins, shallow denudation and breccia. 100 ~150m porphyry and iron-gold ore bodies. The profile shows that the strata and porphyry are from east to west, and the occurrence changes from dynamic to slow. There are faults and porphyry bodies at the stratigraphic turning point, and it is speculated that there are rich and thick ore bodies in the deep. There should be two concealed porphyry bodies on the east side of the ore body, and the gold vein on the west side is1700m long and 400m wide. Bijiashan gold deposit has good metallogenic conditions and the most realistic conditions for increasing gold reserves.

Near noon, the sky is high and the clouds are light, the sun is direct, and the sweat is soaked through the underwear. We walked out of Bijia Mountain and came to a place called Pot Cover Mountain. At the end of the mountain road, we were suddenly enlightened and finally met several families. A small pond in front of the village reflects the whole village. There are several big trees behind the village. On the left side of the village, a gurgling stream flows, and on the right side of the village, there are several sparse vegetable gardens. Every household on the dirt road is connected with their families, and Chai Men is barking and smoky. This lunch includes potatoes, boiled vegetables and a bowl of old bacon. Everyone says they haven't eaten such delicious food for years.