| Location | |
|---|---|
  Härsbacka mine Location in Sweden | |
| Municipality | Österåker |
| Country | Sweden |
| Coordinates | 59°28′49.43″N 18°23′18.78″E / 59.4803972°N 18.3885500°E |
| Production | |
| Products | Quartz, feldspar |
| History | |
| Opened | 1895 [1] |
| Closed | 1946 [1] |
Härsbacka mine ( Swedish: Härsbacka gruva) is a quartz and feldspar mine. It was once Sweden's foremost quartz mine. [2] The mine was closed in 1946. [1] [2] The quartz and feldspar mined in Härsbacka are the main constituent of a large pegmatite dyke. [2] This pegmatite dyke dips about 60 to 70° to the southeast and has a maximum thickness of 37 m. [2] While quartz and feldspar are mostly mixed, pure zones of either occur. [2] Most feldspar is pink microcline perthite and much lesser amounts are white oligoclase. [2] There are lesser quantities of biotite, garnet, molybdenite and fluorite. [2] About 230,000 tons of quartz have been mined in total from Härsbacka mine. [2]
In 1947 the mine was bought by Statens Vattenfallverk to turn it into an oil storage depot and it functioned as such until 1985 when it was emptied. [2] Since 1997 the mine is fully flooded by groundwater. [1] In 2021 the Geological Survey of Sweden was tasked with investigating contaminants in the mine. [1]
| Location | |
|---|---|
Härsbacka mine Location in Sweden | |
| Municipality | Österåker |
| Country | Sweden |
| Coordinates | 59°28′49.43″N 18°23′18.78″E / 59.4803972°N 18.3885500°E |
| Production | |
| Products | Quartz, feldspar |
| History | |
| Opened | 1895 [1] |
| Closed | 1946 [1] |
Härsbacka mine ( Swedish: Härsbacka gruva) is a quartz and feldspar mine. It was once Sweden's foremost quartz mine. [2] The mine was closed in 1946. [1] [2] The quartz and feldspar mined in Härsbacka are the main constituent of a large pegmatite dyke. [2] This pegmatite dyke dips about 60 to 70° to the southeast and has a maximum thickness of 37 m. [2] While quartz and feldspar are mostly mixed, pure zones of either occur. [2] Most feldspar is pink microcline perthite and much lesser amounts are white oligoclase. [2] There are lesser quantities of biotite, garnet, molybdenite and fluorite. [2] About 230,000 tons of quartz have been mined in total from Härsbacka mine. [2]
In 1947 the mine was bought by Statens Vattenfallverk to turn it into an oil storage depot and it functioned as such until 1985 when it was emptied. [2] Since 1997 the mine is fully flooded by groundwater. [1] In 2021 the Geological Survey of Sweden was tasked with investigating contaminants in the mine. [1]