These two hydroseeding mulches are ideal solutions in mine site rehabilitation
Maccaferri Philippines has recently introduced MacFlex High Performance Flexible Growth Medium (HP-FGM) and MacGanics Biotic Soil Media (BSM). These hydroseeding mulches are ideal solutions for revegetation of disturbed sites and great interest has been shown by the mining community.
The Philippine Mining industry has been under increasing pressure from the Department of Environment and Natural Resources to meet stringent environmental, regulatory, social and community regulations. To this end, DENR have conducted a number of site audits citing many mines for non-compliance. The result has been to suspend mining operations at a number of these sites.
Maccaferri understands the sense of urgency of mining firms to deal with waste disposal, water treatment, overburden disposal and revegetation particularly in light of the DENR ‘initiatives’.
Maccaferri Philippines has recently introduced MacFlex High Performance Flexible GrowthMedium (HP-FGM) and MacGanics Biotic Soil Media (BSM). These hydroseeding mulches are ideal solutions for revegetation of disturbed sites and great interest has been shown by the mining community.
Filminera’s Masbate Gold Project was one of the first mining operations to explore the use of Maccaferri’s new hydroseeding mulches to rapidly and effectively revegetate areas on their site. In early November, a small hydromulching machine was shipped to site together with sufficient mulch to conduct a 1 hectare trial using combinations of MacFlex HP-FGM and MacGanics BSM.
Areas chosen for the trial included steep slopes (>40 degrees) and a variety of different substrates including areas partially strewn with boulders and large rocks. Although the products have some limitations when used in areas where there is insufficient granular materials for roots to find purchase, MacGanics BSM has proved to be highly effective in areas where there is no biotic soil content and vegetation cannot easily be established. Instead of importing large quantities of topsoil prior to seeding, the application of a 1” layer of MacGanics provides sufficient to establish vegetation and kick-start a cycle of growth leading to the formation of fertile soil.
Application of mulch on steep slopes can be problematic; typically, heavy rains will wash the mulch away. Maccaferri’s MacFlex HP-FGM has biopolymers which assist in helping the product chemically and mechanically bond with the underlying substrate. Furthermore, the product effectively drains water preventing it from becoming waterlogged but still retains sufficient moisture to promote growth (preventing drying out and crusting).
During this initial trial, both products were used separately; the MacGanics on areas where biotic soil content was known to be minimal and MacFlex in areas with a more suitable substrate. The two products were also used together in areas on steep slopes where MacGanics would overcome poor soil conditions and MacFlex would provide the necessary adhesion qualities.
Initial results of the trial are encouraging. Using a seed mix of white millet (as a nursery crop for speedy germination) and Centrosema as a deep-rooting legume promoting thick leafy coverage, the treated slopes are beginning to ‘green-in’. Within two weeks, initial growth could be seen with an expectation that within 6-8 weeks, plants would have established a toe-hold. Hydroseeded slopes are expected to be well-covered within one to two months despite the challenging conditions for this trial.
Typically, Maccaferri’s mulches are applied after soil testing. This allows for pH balancing and the addition of fertilizers as required guaranteeing a high degree of success.
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