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OMS Guide

The development and implementation of operation, maintenance, and surveillance (OMS) activities, described in a site-specific OMS manual, is essential to implementing a tailings management plan, meeting performance objectives and managing risk. Companies that do not effectively implement OMS activities cannot adequately understand their risks, proactively manage tailings, make informed decisions about tailings management, or have any assurance that tailings and associated risks are being effectively managed.

Developing an Operation, Maintenance and Surveillance Manual for Tailings and Water Management Facilities (the OMS Guide) provides guidance on the development and implementation of OMS manuals.

The OMS Guide was first released in 2004 and was re-released in 2011. A substantially revised and updated second edition was released in 2019. The revised OMS Guide, in addition to the recently updated Tailings Guide will play an important role in providing an even greater level of assurance of this important aspect of the mining process being done in the most responsible way.

As far as MAC is aware, the MAC OMS Guide is the document of its kind that is publicly available and provides guidance on OMS manual development and implementation. The second edition of the OMS Guide is much more closely aligned with the Tailings Guide, providing improved guidance on how to use OMS to implement a tailings management system. It also provides much stronger linkages between OMS activities and performance objectives and risk management plans.

Like the Tailings Guide, the OMS Guide is designed to be applied by MAC members and non-MAC members alike, anywhere in the world.

The second edition of the OMS Guide can be downloaded here:

For MAC members applying Towards Sustainable Mining® (TSM®), there is a transition period for implementation of the second edition of the OMS Guide. For more information on the transition period, please see Description of Phase-in of Updates to the Tailings Management Component of TSM.

Until this transition period is complete, the 2011 version remains available for download:

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