KBK Quarry

The KBK Quarry Project (KBK) is located in Malinau Regency, North Kalimantan Province, and will be one of the leading suppliers of hard aggregates in Kalimantan. The project currently holds roughly 72 million tonnes of mineral resources (JORC, 2012), which will increase by an estimated 50-80 million tonnes by mid-2023. The rock at KBK is known as "Greywacke," and the deposits are to be extracted using conventional drill and blast quarrying methods. Our objective is to safely and cost-effectively meet business requirements, which we will achieve through the appropriate management of risks and by providing our workforce with a safe working environment.

Our operations are part of a fully integrated Aggregate Business Unit, of which all operations are critically interdependent. In this environment, effective business planning, appropriate design, compliance to business processes, and an ongoing focus on cost optimization are paramount. Our ability to extend the life of this asset is closely linked to the effective application of forward planning, real time performance analysis, cost reduction, and efficient capital deployment.

Product Range

Crush Stoned

Rock Dust

(0-5mm size)

This product size is the softest and smallest, the particle size resembles soft sand. This size of split stone is suitable for the process of paving, making culverts, making brick presses, or used as a substitute for sand. This is a very popular sought after product in construction. ​

Crushed Stone

(20-30mm size)

Widely used for floor casting and other horizontal casting materials. It can also very easily be blended to form base product with unique requirements.​ ​

Crushed Stone

(5-10mm size)

This size is widely used for mixtures in the process of paving roads, from light roads to class 1 roads. Split stones of this size are commonly mixed with asphalt to produce hot mixed asphalt.​​

Crushed Stone

(30-50mm size)

Commonly used for the base of the road body before using other materials, rail bearing supports, pipe covers, or ballast on the seabed, and is used to cast concrete breakwaters.​​

Crushed Stone

(10-20mm size)

Popular choice for casting materials of various types of construction, ranging from light to heavy construction. Buildings that use cast concrete from split stone materials of this size include toll roads, multi-storey buildings, airports, railroads, ports/docks, piles, bridges, and others.


(100kg-350kg block)

This type of stone is often referred to as the boulder elephant stone. Elephant/armourstone is a type of split stone that has the largest size compared to other types of split stone. Usually used to make concrete breakwater, beach reclamation material, material for making small piers, and building foundation materials.