SubLevel Stoping - Introduction to Sublevel Stoping INTRODUCTION The sublevel stoping mining method is usually applied to a relatively steeply dipping competent ore body surrounded by competent wall rock Ore is produced by drilling and blasting longholes which can range from 50 mm (2 in ) to 200 mm (7% in ) diam with lengths up to 90 m Sublevel caving is based on gravity flow inside a broken-up rock mass containing both ore and rock The rock mass is first fractured by drilling and blasting and then mucked out through drift headings underneath the rock mass cave It qualifies as a safe mining method because the miners always work inside drift-size openings

Underground Mining

Study 73 Underground Mining flashcards from Kaitlin F on StudyBlue access requires ramp at one end of stope and raise at the other end ramp is constructed and maintained on top of fill stoping consists of 3 blocks: two triangular stops (1st and last) and parallelograms in between bolting and meshing needed for stope support

Caving Underground Mining Methods (longwall Sublevel caving Block caving) 1 This material is intended for use in lectures presentations and as handouts to students and is provided in Power point format so as to allow customization for the individual needs of

The Kimberley mines have weak Karoo age caving using scrapers J agersfontein was the first mine to convert to block caving in the 1950's and following successful implementation here caving became the • Continuous secondary drilling and blasting operations to reduce ore to a

FIELD: mining SUBSTANCE: development method of blind ore deposits involves driving of drilling rooms drilling-out and mass caving of rock ore partial ore drawing induced caving of overlying rocks with delineation of natural arch formation of safety cushion of induced-caved rocks and rocks of uncontrolled caving ore drawing under safety rock cushion and further

Long wall mining Underground Mining Methods Sublevel Open Stoping Blasting towards free space Stoping layout using top hammer drilling Up holes from extraction level Up and / or down holes from drilling levels Max hole length ~ 30 m Sublevel Open Stoping Stoping layout Stoping layout using ITH drilling Longer larger and straighter holes cf top

Lecture 4: Underground Mining

Nov 02 2011Underground mining Underground mining methods Lecture 4: Underground Mining 1 Hassan Z Harraz hharraz2006yahoo 2010- 2011 This material is intended for use in lectures presentations and as handouts to students and is provided in Power point format so as to allow customization for the individual needs of course instructors

- the drilling is done ahead of the blasting and several sublevels can be drilled completely before blasting and production are started - allows selective mining of weak or medium strength ore bodies in weak rock Block and Sublevel Caving quiz 12 terms Sub-Level Stoping 5 terms Vertical Crater Retreat Stoping 4 terms

Katja Sahala Mine Planning Engineer FQM Pyhsalmi mine said she saw the WebGen wireless system as helping operations in several applications such as when ore needs to be left behind to support pillars or where there is weak rock or fill and selective mining is required

DynoConsult was able to provide this operator with the technical support needed to develop a modified drilling and blasting program which reduced near-field vibration impact on the highwall The modified blast design also provided productivity gains by minimizing shovel tramming time and decreasing the downtime associated with blasting operations

- the drilling is done ahead of the blasting and several sublevels can be drilled completely before blasting and production are started - allows selective mining of weak or medium strength ore bodies in weak rock Block and Sublevel Caving quiz 12 terms Sub-Level Stoping 5 terms Vertical Crater Retreat Stoping 4 terms

Exploration Drilling First edition 2010 There is always a better way At our focus on customer productivity requires a steadfast commitment to continuous improvement — and finding solutions It may be a design innovation to our surface and underground drill rigs in-hole tools or diamond products

Oct 23 2014Caving Underground Mining Methods (longwall Sublevel caving Block caving) 1 This material is intended for use in lectures presentations and as handouts to students and is provided in Power point format so as to allow customization for the individual needs of

Business Planning Group Design Guidelines Standards In MMTS Business Planning the long range design group is responsible for the creation of long range mine plans broken down by – Phase 1 Phase 2 Phase 3 studies This document outlines the recommended standards guidelines agreed to be used in long range underground design

Mining History Association Links

Block caving Low cost method of mining in which large blocks of ore are undercut leaving the ore to break and cave under its own weight Blockholing Breaking undesirable large rocks in a pit or quarry by drilling short holes into them and blasting them with explosives Bonanza Very rich ore deposit producing at a profit Borrasca

Block caving with Rio and NCM Caving—from art to science and increasingly important for Rio and NCM Caving has evolved from a low cost mining method to exploit weak orebodies used in the 1950s (mining large blocks of ~100m dimensions hence the term block caving) to now being applied successfully to competent rock masses and hard rock

•Conducting and supervising of all drilling and blasting operations in the open pit The proposed recommendations include the need to use both transverse and longitudinal sublevel caving the extraction sequence maintaining an echelon angle of 45 staggering of stope faces and extensive support to extremely weak zones staggering of

This method is not as popular as it once was Sublevel stoping vertical crater retreat (VCR) sublevel caving and cut-and-fill are all methods that can be applied to ore bodies where shrinkage stoping is feasible The model is valid for operations with daily mining capacities of 100 to 6 000 st/d Base-case cost model equations are in table

(4)Sublevel Stoping: It is a vertical mining method in which large open stope is created within the vein this open stope is not meant to be occupied by miners therefore all work of drilling and blasting must be performed from sublevel within the ore block