Terramin TSF Base Lining. Examining the design criteria :– a risk based design process Agenda for Strathalbyn CCC Meeting Review of the relevant components of the TSF Guidelines developed specifically for the project Interaction between PIRSA and the EPA Specific design criteria
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Examining the design criteria :– a risk based design process
Agenda for Strathalbyn CCC Meeting
Guidelines for the Management of Tailings
Proposed Angas Zinc Project,
Strathalbyn, South Australia
How was the area of the “design” decant pond determined?
How is the phreatic surface to be restricted to the area covered by the double liner?
How will the tailings be discharged into the TSF and how will it fill?
What is the decant and how will it operate?
How will the maximum area of the decant be monitored?
How will the tailings be prevented from polluting into the future?
Should be considering volume rather than area, but with consistent beach slopes there is a relatively consistent relationship between the two as shown below.
100 yr (ARI) event
The TSF has been designed to perform as simulated in the flow net analyses. A few design details are now covered
A series of 5 drawings have been prepared by ATC to show the extent of deposited tailings and the “design” decant pond at various stages during the life of mine.
These assume that the throughput of the plant is uniform and continuous and that 100% of the tailings are directed to the TSF.
The operating conditions set by PIRSA and the EPA will require that:
The edge of the “design” decant pond does not extend beyond a distance of half the extent of the double liner.
How this is to be monitored has yet to be finalised, but one concept would be to install sight boards. For example:
The question will be how quickly the phreatic surface advances through the tailings and this is a function of the permeability of the tailings.
Modelling currently under way by ATC suggests that even with the 100 yr ARI flood, that the phreatic surface will not reach the boundary of the double liner in 6 months. This however has yet to be confirmed.
100 yr flood