Gravel extraction operations have been conducted within the large ice river stratification Gråbo Delta for over 70 years. Jehander’s pit in the area has been used as a gravel pit since 1930, the last 20 years by Jehander. It is now closed, and an after-treatment (reclamation) of the quarry should be done. Traditionally, mainly pine trees have been planted at terminated pits, but in recent years, studies show that large biological values are lost in such remediation. Nowadays it is recommended to develop a biological remediation plan which is also the plan for the Gråbo gravel pit.
The gravel pit is located in Gråbo, Lerum municipality and is located in Gråbo delta which is a large glaciofluvial deposit running from south west to north east. In the southern part, there are steep ridges and on the north side there are south-facing slopes with open gravel. The low-lying eastern part is more humid with several major bodies of water, while the western part is characterized by dense pine forest. Just north of the quarry, Lake Mjörn is situated, with deciduous swamp woods.
Gravel pits can experience many groups of organisms but the most common are butterflies, solitary bees, other insects and various parasites which have been noticed in the parts of the quarry that consist of open gravel.
As the environment that is found in gravel pits are in short supply in nature, you will also find an interesting flora here. This is something that can benefit insects. Gravel pits also benefit birdlife. Most sand martin colonies are found in this environment. Small plover is also often found here.