Tseung Kwan O Area 137 Fill Bank Bentonite

Material categories:

Soil / Soil based (organic/mineral)

Mineral / Mineral based

Identification number:


Sample produced by:


Sample date:

19 Jul 2023 (Received)

Sample condition:


Site-driven material

Within Hong Kong bentonite is used as a coating or lubricant for large construction drilling. The bentonite is mixed with water and used to coat the drills to make sure they are operating correctly. After the large holes are made in the ground the liquified bentonite is pumped out of the hole into large trucks. These trucks are transported to the Tseung Kwan O Area 137 Fill Bank where the liquified bentonite is then processed through a highly energy intensive method of pressurizing and effectively squeezing the water out of the bentonite. What is produced is dried blocks and slabs of material that can then be recycled and used again in different construction site within the drilling process.

Depth of sample extraction:

On/Above Ground

Slope at extraction point:

< 35°

Land Use:

Vacant land/construction in progress

Natural or imported material:





10YR 7/3

Soil Structure

Organic Matter: 0.0 %

Coarse: 0.0 %

Sand: 20.0 %

Silt: 14.0 %

Clay: 66.0 %

Production Attribute

Distance from source location: <= 100km

Production Energy: High

Water Footprint for Production: High

Ecological Attributes

Recycling Percentage: 100%

Reclaimed Components: 100%