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Direct revegetation of coal tailings at BHP-Saraji mine (Central Queensland)

conference contribution
posted on 06.12.2017, 00:00 authored by B Radloff, Kerry WalshKerry Walsh, Alistair MelzerAlistair Melzer
A direct revegetation strategy involving minimal capping for coal tailings is sought to reduce dust hazard and maximise the potential for later coal extraction. Coal tailings produced from washing mined material are composed of ca. 50% coal and 50% inorganics and are pumped as a slurry(c.30% solids) to holding dams for disposal. On cessation of filling, surface crusting slows evaporation, and slow drainage limits consolidation and vehicular access. Studies were conducted on tailings dam #3 at Saraji Mine. The dam has a storage capacity of ca.3,500,000 m) (20 m height, 23 ha) and was last used in 1985. The moisture content 1 m below the surface was, in July 1994, 10-30%. Substrate characterisation indicated the material should allow growth of salt tolerant plants, with a pH1:5 of 6.5-8.5 and a salt content (EC 1:5) of 2.5 dS.m-l , except in the immediate area of the old inflows where substrate pH was low (pH1:5 2-4. Nutrient analyses indicated a low CEC (<20 meq.lOOg-1), with deficiencies in N (0.6 mg N03:N.kg-l) and P (bicarb extractable; 6 mg PO4.kg-1). Plant available moisture was 20%, but the material was poorly aerated where moisture content was high.

History

Start Page

129

End Page

138

Number of Pages

10

Start Date

01/01/1995

ISBN-10

0909276617

Location

Darwin, N.T.

Publisher

The Council

Place of Publication

Dickson, ACT

Peer Reviewed

Yes

Open Access

No

Era Eligible

No

Name of Conference

Minerals Council of Australia. Environmental Workshop

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