Our experience in monitoring in many locations worldwide allows for continual evolution of design methodologies by learning through interpretation of detailed monitoring data. Hence, Okane’s design methodology uses an approach of adaptive continual improvement.
This provides integrated solutions for:
- dust and erosion control;
- chemical stabilisation of acid-forming mine waste (through control of oxygen ingress);
- contaminant release control (through control of infiltration); and,
- provision of a growth medium for establishment of sustainable covers.
There has been a general tendency in the industry to develop performance criteria for cover systems that are tied directly to various cover design objectives. In many cases, this practice has led to the development of overly-conservative targets for cover performance, generally relating to net percolation, oxygen ingress and / or plant density and diversity. Okane provides practical solutions tailored for the site location, climate, scheduling and site constraints, to develop cover performance criteria on a case-by-case basis.
Landform design for mine closure requires a holistic view of mine operations, where each operational stage and each domain is part of a plan that considers the end land use as well as the immediate need. This plan, which needs to be flexible to accommodate changes in methods and / or technology, is about optimising post-mining land capability, limiting the costs in achieving optimal land use, and minimising long-term maintenance liabilities.
Surface water management systems must be robust to ensure long term stability and environmental performance. Informed landform design considers the specific climate for planning long-term drainage of plateau and embankment surfaces. Okane’s innovative landform designs are provided by highly skilled and experienced personnel using state of the art numerical models.
We routinely use commercial landform evolution models, including WEPP, SIBERIA and CAESAR to create our designs. This, coupled with our capabilities using hydrological models and commercial CAD and GIS software allows Okane to provide first-class engineering designs and visualisations.