Drilling and Blasting. All work of drilling, xxxx xxxxxxxxx, and blasting. Operation of all rock and concrete drills, including handling, carrying, laying out of hoses, steel handling, installation of all temporary lines and handling and laying of all blasting mats. All work in connection with blasting, handling and storage of explosives, carrying to point of blasting, loading holes, setting fuses, making primers and exploding charges. All securing of surface with wire mesh and any other material and setting of necessary bolts and rods to anchor same. All high scaling and other rock breaking and removal after blast. Handling and laying of nets and other safety devices and signaling, flagging, road guarding.
Drilling and Blasting. All work of drilling, xxxx xxxxxxxxx and blasting. Operation of all rock and concrete drills, including handling, carrying, laying out of hoses, steel handling, installation of all temporary lines and handling and laying out of all blasting mats. All work in connection with blasting, handling and storage of explosives, carrying to point of blasting, loading holes, setting fuses, making primers and exploding charges. Xxxxx Tender: Distribution of all materials used by a brick xxxxx by any method including distribution by motorized wheelbarrows, power pulleys, walk along forklift trucks, forklifts, all terrain forklifts, skid-steer loaders, skid-steer type tract loaders, or other machines of similar or like characteristics, whether driven by gas, diesel, or electric power, including the hooking on and signaling for the same, shall be the work of qualified laborers. This includes brick, mortar, tile, block, stone, ringing signal bells on elevator hoists. The covering, hanging, placing tarps, visqueen or any other material for the purpose of protection or other purposes, shall be the work of the laborers. The erection, dismantling and maintenance of all scaffolding regardless of height shall be the work of the Laborers. The pouring, puddling, and vibrating of all masonry walls, with concrete vermiculite, sand, insulation or any other materials shall be the work of qualified Laborers. In addition to performing all xxxxx tender work, the Laborer shall also be able to assist with the bricklayer saw cutting, scarping, rubbing, grinding, and grouting of masonry walls. The assistance in the application of waterproofing and plastering of masonry walls below grade, including tarring or other similar types of waterproofing, whether applied with a roller, brush, or sprayed. The assistance in the washing and cleaning of masonry walls by any method or solution, pressure washed or including patching and repair if needed during the process. The assistance in the laying or placement of large pieces of masonry such as cap stones, headers stones, or skills.
Drilling and Blasting. Due to the small floor area of the vertical pit and the fact that withdrawing the earthmoving, drilling, pumping and wetcreting equipment from the pit prior to each blast was not practically feasible, much emphasis was placed on the blast design and the type of explosives used in order to avoid damaging the vertical pit sidewalls or in-pit equipment. An additional difficulty arose sourcing suitable explosives and importing them into the country. AEL Ghana was the only supplier able to provide the required explosives and accessories. Working in conjunction with AEL’s blasting experts and with input from SRK Consulting, an optimal blast design was found for the vertical pit. AEL’s initial blast design involved the use of 45 mm and 54 mm diameter holes. These diameters were based on a bench height of between 2 m and 3 m, which was limited in attempts to minimize damage to the pit walls. However, due to logistical and operational reasons, the mine standardized on 76 mm diameter for both anchor and production holes. In view of the sequencing and support parameters, a 3.2 m bench height, with a 1.5 m x
Drilling and Blasting. All work associated with the drilling, blasting secondary breaking of extractive materials within a worksite and including general maintenance.
Drilling and Blasting. The ore or rock in Block-1 is very friable, there will not be drilling and blasting in Block-1.
Drilling and Blasting. Drilling and blasting of Waste and Ore material in accordance with Exhibit D; Contractor shall maintain a size distribution in the blasted Ore material suitable for gold extraction through the heap xxxxx process. Contractor shall provide adequate and safe access to Owner's personnel for purposes of sampling the drill cuttings to determine optimal Ore / Waste boundaries. Due to the proximity of the Mine to the town of Cerro de San Xxxxx and to the historic church of San Xxxxx Xxxxxxx, Contractor shall coordinate closely with Owner to carefully monitor blasting. Crushed stone for stemming shall be used, if required, to minimize fly-rock, and to improve fragmentation of the Ore material. To enhance the performance of the heap xxxxx process, the size distribution of Ore material shall have a maximum dimension of 900 mm. Peak particle velocity at the church shall be limited to 0.5 ft/sec, (which is the UNITED STATES BUREAU OF MINES standard for old construction). Monitor points, installed and monitored by Owner, shall include the dome and corners of the foundation of the San Xxxxx Xxxxxxx church, as well as strategic points to be determined by Owner within the town of Cerro de San Xxxxx. This may require the use of decking and/or smaller holes in the area close to the town. Exact blasting parameters to be followed by Contractor will be based on test blasting and/or initial operating experience.
