Views from Space and News | Alpha Goldmines

news 2022.12.23

Sentinel-2 L2A satellite image of the Orxontuul-4 mine area taken on 23 December 2022 showing pit and processing area.

News 2022.12.13

Sentinel-2 L2A satellite image of the Orxontuul-4 mine area taken on 13 December 2022.

News 2022.11.28

Landsat-8 satellite images of the Orxontuul-4 mine area taken on 28 November 2022. The area has been under a blanket of snow since mid-November.

News 2022.08.30-2

Orxontuul-4 Iron sulphides oxides 20220830

Sentinel-2 L2A satellite image of the Orxontuul-4 mine area taken on 30 August 2022. False colour composite image using the Iron Oxides Index B04(Red)/B02 (Blue). The IO highlights Fe-sulfides and -oxides.

News 2022.08.30-1

Sentinel-2 L2A satellite image of the Orxontuul-4 mine area taken on 30 August 2022. False colour composite image made of the healthy vegetation band combination NIR (as red), SWIR1 (as green), Blue (as blue). Healthy vegetation appears in yellow and orange shades. Bright blue colours represent barren soil and rocks. Clear water appears in dark blue. Where the water contains sediments it appears in various shades of lighter blue.

News 2022.05.22

Sentinel-2 L1C satellite image of the Orxontuul-4 mine area on 22 May 2022. IR false color composite image. Deeper red hues indicate fresh, healthy vegetation. Light red hues show sparsely vegetated areas. Greenish color indicates bare soil.

News 2022.05.02-3

Sentinel-2 L2A satellite IR false colour image of the Orxontuul-4 gold mine area on 2 May 2022. Image resolution (smallest interval measurable): 5m.

News 2022.05.02-2

Sentinel-2 L2A satellite infrared false colour image of the Orxontuul-4 gold mine area on 2 May 2022. Reddish color indicates vegetation.

News 2022.05.02-1

Sentinel-2 L2A satellite true colour image of the Orxontuul-4 gold mine area on 2 May 2022.

News 2022.04.02

Sentinel-2 L2A satellite image of the Orxontuul-4 wider mine area taken on 2 April 2022 and rendered by bands (B12)/(B8A*B09). Violet colours show colder regions, luminous crimson colours show warmer areas. Note the nearly black water ponds of the mine, which are still frozen.

News 2022.03.28

Sentinel-2 L2A satellite natural colours image (below) and IO image (above) of Orxontuul-4 mine taken on 28 March 2022. IO stands for iron oxides and iron sulphides rendered by bands ratio B04/B02. High values (red spot) in Pit 2.

News 2022.03.09

Landsat satellite true colours image taken on 9 March 2022. View of the Orxontuul-4 mine area. With the arrival of spring the ice of the water ponds has begun to melt.

News 2022.02.11

Sentinel-2 L2A panoramic view of Orxontuul-4 gold mine on 11 February 2022. View towards north. Visualised NDSI (Normalised Difference Snow Index). Snow cover is represented in bright blue, snow-free land in brown.

News 2022.01.17

Sentinel-2 L1C satellite natural colours image. View of the snow-covered Orxontuul-4 mine area on 17 January 2022. The water ponds next to the gold concentrator are frozen.

News 2021.12.28

Sentinel-2 L2A satellite natural colours image of Orxontuul-4 mine on 28 December 2021.

News 2021.12.27

Landsat-8 RT natural colours image of Orxontuul-4 mine on 27 December 2021.

News 2021.11.21

Sentinel-2 L2A natural image taken on 21 November 2021 shows first snow in the Orxontuul-4 mine.

News 2021.11.13

Sentinel-2 L2A image of Orxontuul-4 taken on 13 November 2021. No changes have been detected since 8 November (see below). The mine area is still free of snow. Ice appears vivid red while liquid water appears very dark. Vegetation appears greenish and bare soil shows a bright cyan colour.

News 2021.11.08

Sentinel-2 L2A images taken on 8 November 2021. The ground and the water have begun to freeze. This combination (blue, SWIR1, SWIR2) reveals some ice in the upper image. The more ice, the stronger the absorption in the SWIR bands, and the more red the color. Bare soil appears bright cyan. Water appears very dark.

News 2021.10.17

Beautiful Sentinel-2 L2A false colour images of the surroundings of the mine on October 17. The top image was made with the natural colour band combination on this sunny day. Some higher mountains are snow-covered. The bottom image was made with a band combination that spotlights soil aspects (B02, B11, B12). The only visible light is coloured in red. This band combination is sensitive to dry and wet soils, soil type, minerals, geology, and vegetation. Vegetation appears greenish, cyan colours mark bare soil.

News 2021.10.12

Sentinel-1 satellite active sensors radar data (Ratio (VV, VH, VV/VH)) reveal transcurrent tectonics around the Orxontuul-4 area. The images show extensional structures (shear lenses and flower structures) along strike-slip faults in the lithosphere. VV polarization reveals terrain roughness. Open surface is coloured in crimson.

News 2021.10.04

Sentinel-2 L1C false color image of the mining area on October 4 made with the natural color band combination.

News 2021.09.29

Sentinel-2 L2A false color images of the mining area on September 29. The mountains received the first snow of the season. The top image was made with the natural color band combination. The middle image made with the NDSI (Normalized Difference Snow Index) reveals foremost snow (blue areas), while ignoring cloud cover. The bottom image was made with a custom band combination that removes dark cloud shadows (note: it does not indicate snow).

News 2021.09.27

3-D images taken with Sentinel-2 satellite show the conditions at the Orxontuul-4 gold mine on 27 September 2021. Mining operations are temporarily suspended due to the Covid circumstances.

News 2021.09.19

Sentinel-2 L1C false color images of the actual mining area on September 19. The upper two images made with the ARVI respectively NDVI Classic vegetation index show the relative biomass. The higher the index the relatively more vegetation is there. The lower image is a heat map, on which a high index number (white, yellow) shows a heated region and a low index number (blue) shows a cooler area.

News 2021.09.09

Sentinel-2C images of Orxontuul-4 mine area. Lower false color composite image: Healthy vegetation is coloured in light green, bare ground and sparsely vegetated area is coloured in shades of mauve. Water appears blue.

News II 2021.08.05

Orxontuul-4 Sentinel Image on 2021.08.05 False Color

Sentinel-2A false color composite image of Orxontuul-4 gold mine taken on 5 August 2021. The vegetation appears in red colour.

News 2021.08.05

Orxontuul-4 Sentinel Image on 2021.08.05 Heat Index

Sentinel-2A image of Orxontuul-4 gold mine taken on 5 August 2021. This Heat Index reveals the warm areas. The gold washing plant and the camp clearly stand out from the surroundings.

News 2021.07.14

Orxontuul-4 Sentinel Image on 2021.07.14

False-color composite satellite image of Orxontuul-4 mine. Near Infrared NIR (coloured red), red light (coloured green), green light (coloured blue). The grassland appears deep red, as plants reflect more NIR than green. Bare ground is gray or tan. Clear water is black, but in the image above, the water of the ponds is muddy and the sediment reflects light. This makes the water look blue. The sky was cloudy. Clouds are white, their shadows on the ground are dark.

News II 2021.06.11

Orxontuul-4 Sentinel Image Pit2 20210611

Sentinel-2 images of Orxontuul-4 gold mine taken on 9 June 2021. Images showing reflectances of wave bands from left to right: Blue band B2 (visible), Green band B3 (visible), Red band B4 (visible), Near Infrared NIR B8 (invisible, green coloured), Short Wave Infrared SWIR2 B12 (invisible, blue coloured). Note: Chlorophyll of plants strongly reflects NIR (bright green). Water entirely absorbs NIR (dark) and SWIR2 (dark blue coloured). Mouse curser over Pit2.

News 2021.06.11

Sentinel 2 image of Orxontuul-4 gold mine taken on 11 June 2021. Index stack band combination. Vegetation displays as green, water and wet areas as purple, barren land as blue and bluish. Veils of high clouds also appear as magenta. Mining is about to resume.

News 2021.05.21

Distribution of gold occurrences in 2021 boreholes

Bead Mining has extended the deeper placer at Orxontuul-4 by at least 350 m in the north. The extension drilling was carried out on cross-lines 37, 38, 39 and 41 in March - April 2021. Gold was found in 50 sections, each 40 cm long. The extension drilling in the south is awaiting decision.

News 2021.05.20

Orxontuul-4 Sentinel Natural Image 20210520

Orxontuul-4 Sentinel Atmospheric Penetration Image 20210520

Orxontuul-4 Sentinel Atmospheric Removal Image 20210520

Sentinel 2C images of greater mine area on 20 May 2021. From top to bottom: Natural colors, atmospheric penetration (bands B12,B11,B8A. No visible bands), atmospheric removal (bands B12,B8A,B03). Mining will resume in early June 2021.

News 2021.05.02

Orxontuul-4 Sentinel Image Color Infrared 20210502

Sentinel 2A color Infrared image showing fresh vegetation (red color) on 2 May 2021. Mining is temporarily suspended due to Covid-19 situation.

News 2021.05.01

Landsat satellite natural image with atmo removal (SWIR2, NIR, Red) of the Orxontuul-4 placer mine on 1 May 2021.

News 2021.04.22

Orxontuul-4 Sentinel Image four images 20210422

Sentinel 2 satellite images of the Orxontuul-4 gold mine taken with different sensors on 22 April 2021. Polarised light, SWIR-Infrared, color infrared, natural (from left to right).

News 2021.04.20

Orxontuul-4 Sentinel-2 Terrain Image 20210417-1

Orxontuul-4 Sentinel-2 Terrain Image 20210417-2

Orxontuul-4 Sentinel-2 Terrain Image 20210417-3

Sentinel 2 satellite images of terrain around Orxontuul-4 gold mine on 17 April 2021. Red = Terrain over 1200 m a.s.l. The pit is located at the altitude of 1070 m a.s.l.

News 2021.04.17

Sentinel 2C true color satellite image of the Orxontuul-4 wider area on 17 April 2021, where mining has temporarily halted due to the COVID-19 situation. The Boroo goldmine was operated by Centerra and produced 56.7 tons gold in 2004-2017.

News 2021.04.07

Sentinel 2A true color satellite image of the Orxontuul-4 placer mine on 7 April 2021. Mining is continuing.

News 2021.04.02

Sentinel 2A true color satellite image of the Orxontuul-4 placer mine on 2 April 2021 showing a thin snow cover on the area. Mining is continuing.

News 2021.03.31

Sentinel-2A SWIR-NIR-blue image of Orxontuul-4 placer mine on 31 March 2021 after snowstorm on 28 March 2021. Water pond in blue, remains of snow in river channels in cyan, clouds in white. Mining is continuing.

News Galgatain 2021.03.30

Sentinel 2A satellite images of Galgatain on 30 March 2021. Image above shows natural colors. Image below is shortwave infrared image with bare ground in red-orange, forest in green, open water in blue, snow in cyan.

News 2021.03.23

Sentinel 2A True Color 3D Image-4 23.03.2021

Sentinel-2A true color 3D image of Orxontuul-4 placer mine on 23 March 2021. Mining is continuing.

News 2021.03.21

Orxontuul-4 Landsat Image Color Infrared 20210321

Landsat color infrared image of Orxontuul-4 on 21 March 2021. Water ponds adjacent to the gold concentrator in blue color.

News 2021.03.16

Orxontuul-4 Sentinel Image Color Infrared 20210316

Sentinel color infrared image on 16 March 2021 after snowstorm at Orxontuul-4. Water ponds adjacent to the gold concentrator in blue color. 10-year snow and sand storm over Mongolia and China on 15-16 March 2021. First gold was sold on 16 March 2021.

News 2021.03.13

Orxontuul-4 Sentinel Image Color Infrared 20210313

Sentinel color infrared image of Orxontuul-4 on 13 March 2021.

News 2021.03.08

Orxontuul-4 Sentinel-2 SWIR Image 20210308

Sentinel-2 shortwave infrared (SWIR) 3-D image of Orxtonuul-4 mine on March 8. Blue in center = water ponds adjacent to the concentrator plant.

News 2021.03.05

Orxontuul-4 Sentinel Image Water Index 20210305

Sentinel water index image of Orxontuul-4 on 5 March 2021 showing water ponds adjacent to the gold concentrator in yellow and red color.

News 2021.03.01

Orxontuul-4 on 1 March 2021. Sentinel-2 color infrared image above, open water in sapphire blue. Shortwave infrared image below, open water in blue.

News 2021.02.26

Landsat-8 infrared image of Orxontuul-4 mine at the end of February.

News 2021.02.24

Sentinel-2 infrared image of Orxontuul-4 mine showing water ponds free of ice. Open water in sapphire blue.

News 2021.02.21

The ice on the ponds adjacent to the concentrator of Orxontuul-4 has melted. Shortwave infrared image with bare ground in orange, open water in deep blue.

News 2021.02.17

Frozen ponds adjacent to the concentrator of Orxontuul-4 on 17 February 2021. Natural colors in image above (snow in white). Reflectance of blue light in image below (snow in blue). Night temperature -43° C. Day temperature -30° C at mining site in January 2021. Gold production began on 25 January 2021.

News 2021.01.02

Snow covered mine area of Orxontuul-4 on 2 January 2021. Distance between pit (above) and processing plant (below) is about 2 km.

News 2020.12.15

Open water (blue spots) in the pit and frozen water ponds of the processing plant of Orxontuul-4 mine on 15 December 2020.

News 2020.11.29

First snow covers the Orxontuul-4 mining area on 29 November 2020.

News 2020.10.28

Frozen water pond (white spot) adjacent to the concentrator plant at Orxontuul-4 placer mine on 28 October 2020.

News 2020.09.26

Gold mines along the Tuul river and its side valleys north of Nariin Gol on 26 September 2020.

Financing Round 2022-2023

Mining Season 2022

Orxontuul-4 on Sale

Mining Situation in 2020-2021

Earth Observation Satellite Images