Korab Resources

Geolsec Phosphate Operations Pty Ltd (Geolsec) is a 100% owned subsidiary of Korab Resources Ltd. Geolsec is the operator of the Geolsec rock phosphate (RP) mine.

Contact: geolsec@korab.com.au
Telephone: (08) 9474 6166
International: +61 8 9474 6166

Geolsec mine is located just a short drive from Darwin suburbs (70km from CBD). It can be accessed by Stuart highway and Batchelor road. Darwin-to-Adelaide railway line is just few kilometers from the project.

Geolsec's mission is to become a preferred supplier of environmentally-friendly organic products to the agricultural sector in the Northern Territory and beyond and thus support further expansion of sustainable agriculture. Geolsec direct application phosphate has a potential to provide substantial ongoing benefits to the environment by reducing farmers' reliance on soluble fertilisers, improving soil fertility and improving nutritional quality of produce grown on fields fertilised with RP and rock dust products.

The recommended application rates for organic RP vary depending on acidity (Ph level) of the soil, the initial P content and the targeted P content in the soil. Depending on these factor, RP is usually applied at a rate of between 560kg and 2,250kg per hectare per year.

Organic products based on ground-up RP such as Geolsec offer several advantages over chemically processed soluble fertilisers such as DAP, MAP or superphosphate:

  • Organic fertilisers slowly release nutrients into the soil matching the speed at which the nutrients are being absorbed by the plants.
  • Phosphate rocks are natural minerals requiring minimum metallurgical processing. Their direct application avoids the production of polluting wastes such as phospho-gypsum and greenhouse gases, thus resulting in energy conservation and protection of environment from industrial pollution.
  • Phosphate rocks for direct application can be more efficient than artificial fertilizers in terms of phosphorus (P) recovery by plants under certain conditions. Based on the unit cost of P, natural phosphate rock is usually the cheapest.
  • Use of organic phosphate rock reduces the risk of harmful accumulation of nutrients in the soil and reduces soil salinity problems
  • Use of organic phosphate instead of chemically processed phosphate avoids the serious environmental degradation caused by increased concentrations of fertilisers in the ground water, the rivers and the coastal waters.
  • Phosphate rock has the ability to restore microelemental and microbial soil balance which in turn leads to less reliance on artificial fertilisers and better crop yields.
  • Plants grown on organic phosphate rock fertiliser have a better nutritional quality.
  • Because of phosphate rock's unique chemical composition, incorporation of phosphate rock into the soil enhances its biological activity and increases soil carbon (C) accumulation, leading to improved soil fertility and restoration of its physical and chemical properties.
  • Organic phosphate rock is a source of several nutrients other than P. Rock phosphates are usually applied to replenish soil P status, but phosphate rock also provides other nutrients present in our rock.
  • Application of organic phosphate has a potential trigger effect on plant growth and crop yields as a result not only of P release but also of phosphate rock's effect on increasing exchangeable calcium (Ca) and reducing Al saturation.


Location of Geolsec short drive from Darwin, near Stuart Highway and Darwin-Adelaide railway line

Vermeer continuous miner crushes rock in-situ

Loading of 1-tonne bags for aerial application

High specific gravity and small particle size makes Geolsec ideal for aerial application

Ground-up phosphate rock improves soil fertility

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