www.valenza-engineering.com 381_R_04_Rev 0 OGNZL_WUG_Phase1_Conceptual_Mitigation 34 5. Observation of pressure change in multi-level instruments; and 6. Tertiary progressive grouting if needed. In this configuration, and according to the level of connectivity impact identified, a stope which has been treated with pre-development grouting may require post-development treatment (in green in Figure 6-3) as multi-level instruments (in black with blue crosses) record any change indicative of a defined trigger exceedance. Figure 6-3: Combined Instrumentation and response grouting in a stopping configuration (adapted from MMG Dugald River trial stoping - Underground Design Methods 2015 – ACG)
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