Since January 1997, the site The Land Aurifères (LTA) is the subject of a detailed study in the MEND program (Project 2.22.4) in order to study the performance of the built-up roofing on the park potentially acid generating tailings. It is a collection multilayer built a large scale (60 hectares) in winter 1996. The thin layer is used mainly composed of alkali tailings. In addition to being the first collection of this type (oxygen barrier) to be built in Canada (and probably elsewhere), this project has the advantage of upgrading mine tailings.

The main objective of this report is to present the different aspects required to complete the project design stage to the finished product and, presenting the various steps performed during the project. The theoretical aspects of the functioning of Roofs and design methods have already been treated extensively in the literature. The present report is rather a practical example of application of this type of technology.

This report presents the initial problematic, making the scheme used and described the campaign exhaustive laboratory tests as well as the fundamental properties of materials were used during construction. The sequence of events and construction challenges will be presented later, including a description of the instruments used for monitoring. The analytical results presented in this report provide a preliminary comparison of the properties observed in situ with those obtained in the laboratory.

Conclusions are drawn around a discussion of the applicability of this technology to other sites. A monitoring report behavior (project 2.22.4b) will be available in 1999.