7/25/2019 Elevate Ground Support

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Initiative #225Elevate ground support specifications to reduce ground control rework/rehab etc.

Initiative DescriptionOptimise ground control standards to improve, reduce ground support rework by elevatingground control specs, consistently delivering better QA/QC on ground support.

To reduce rehab shotcrete.

To improve cycle time.

Enabling proect !or accelerated production/ore tonnes.

Key Decisions and interdependencies

"educe rehab, wastage, poor per!ormance ground support, recovery o! #O$ etc.Enabling proect !or accelerated production/ore tonnes.

ow does this initiative change and i!prove our business perfor!ance

%hotcrete &Child 'nitiative o! ()*)+ (-+

$osowong previously used 0archip %hogun &supplied by E1C but changed to %ynmi2 ))&0ekaert as part o! a cost saving inititive in the past &early *3-.

0ased on the manu!acturers supplied data, all o! the E1C !ibres manu!actured !rom modi!iedole!in are over twice as strong as the polypropylene %ynmi2 )) !ibres.#rom available toughness test results, the E1C !ibres have greater toughness capacity per

kg than the %ynmi2 )) !ibres.4igh per!ormance shotcrete is essential at 5encana Toguraci given the de!ormationse2perienced. A high capacity shotcrete gives the added bene!its o!6

'mproved con!inement o! the rockmass

'mproved post7crack behaviour

"educed rehabilitation/re7spray re8uirements

On a cost basis, the %ynmi2 )) and 0archip ") !ibres are the same price per kg, however%ynmi2 )) provides signi!icantly less value in terms o! residual load capacity and toughnessper unit cost.The best !ibres under this parameter are the 0archip "), !ollowed by 0archip )9 !ibres.

:se o! long anchors in T9 ground is sound engineering with higher bond strengths over alonger tendon length generating signi!icantly better capacities/support resistance.