Doral Mineral Sands, Initial Hydrogeological Review of the Stratham proposed mineral sand mine

Doral Mineral Sands, Initial Hydrogeological Review of the Stratham proposed mineral sand mine

Doral proposes to mine Heavy Mineral Sands within the Yoganup Formation and overlying Bassendean Sand at Stratham. The superficial
sequence will need to be dewatered to allow dry working.

An initial hydrogeological review was undertaken to assess the site environment and the potential impacts from the development. The surface
water hydrology of the area was reviewed; the majority of the site is located within the Cokelup Swamp catchment, while the southern part is
within the Gynudup Brook catchment.

Unconfined groundwater is present at shallow depth within the superficial aquifer. Groundwater within the underlying regional Yarragadee aquifer
may be semi-confined in the upper part of the sequence.

There are a number of local groundwater users for agricultural purposes near to the site. In addition there are numerous groundwater dependent ecosystems (GDEs) that could potentially be affected by the dewatering,
including Cokelup Swamp. Potential Acid Sulfate Soils (PASS) areas may also be affected.

Analytical modelling was undertaken to assess dewatering requirements and the extent of water table drawdown.

Potential effects were assessed and where needed possible mitigation measures were proposed to offset any likely impacts identified.

Stuart Jeffries
Hydrosolutions Pty Ltd

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