SGME T-02 Memorandum
Stable; and Able to sustain an appropriate land use after rehabilitation or restoration.
As of 26 May 2025, Environmental Authority (EA) EPML00433013 authorises Sandstone Gully TSF as a mining activity, however Upper Mundic Gully TSF is not authorised. An amendment application for Upper Mundic Gully TSF was lodged to DETSI during October 2025 and it is anticipated that approval will be given during Q3/Q4 2026. The rehabilitation requirements from Table F2 of the EA are replicated in Table 1. It must be demonstrated through design processes that these rehabilitation objectives are achieved. Table 1: Rehabilitation requirements from EA
Land Suitability Objective
Mine Feature
Rehabilitation
Final Land use
Sandstone Gully TSF
Completely backfilled. PAF waste rock and tailings transferred from stockpiles to void. Water removed.
Land management monitoring and maintenance of rehabilitated areas
Class 4
Dry cover store and release. Drainage system constructed.
1.3 TSF Closure strategy 1.3.1 Final Land Use
The DNRMMRRD medium and long-term remediation strategies for the site do not contemplate an ongoing use of the TSFs at the completion of Heritage Minerals' reprocessing activities. On 6 February 2025, DETSI made an amendment by agreement to Table F2 of the EA to require a rehabilitation outcome of 'land management monitoring and maintenance of rehabilitated areas' for all mine features. This definition confirms that the land cannot be rehabilitated to support another use that is unrelated to mining. The outcome for the land is simply the monitoring of mined areas.
1.3.2 Rehabilitation Methodology Heritage Minerals have an obligation to achieve a safe, stable and non-polluting landform able to sustain an appropriate land use after rehabilitation or restoration. The proposed rehabilitation commitments for both TSFs are as follows: Completely backfilled with tailings. PAF waste rock exposed during construction transferred to void; Water removed from surface; Dry cover store and release installed; and Drainage system constructed. The rehabilitation methodology for the Upper Mundic Gully TSF will involve the following aspects: Fill the TSF to the maximum permissible RL to achieve the final landform; Shaping of the tailings surface to provide a direct flow path to the spillway and minimise or prevent ponding of water; Runoff management systems installed on the embankment;
Page 2
Powered by FlippingBook