Melaksanakan Pengeboran Sesuai Rencana Kerja - Geologi Pertambangan

Summary

The video provides an insightful overview of the drilling process used in mining, specifically for creating blast holes at the CV Andhika Karya mining site in Yogyakarta, Indonesia. The process includes explaining different types of drilling systems and equipment, such as the crawler Rock drill and rotary percussion system, and detailing factors like drilling geometry, drill hole depth, and slope. The drilling activities are aligned with blasting operations to ensure optimal rock fragmentation. It also highlights the importance of precise planning, preparation, and inspection to ensure successful blasting outcomes, all aimed at enhancing vocational education in mining practices.

Takeaways

• 😀 Drilling activities are essential for creating blast holes in rock blasting operations, and they are the first step in preparing for explosions in mining.
• 😀 Drilling machines are used to create blast holes, with a mechanical system that can be percussive, rotary, or rotary-percussive, depending on the rock type and field conditions.
• 😀 The selection of the type of drilling system depends on factors like the method, rock type, field conditions, and desired rock fragmentation.
• 😀 The drilling process involves checking the location, cleaning it, and marking points before preparing the drilling equipment and checking its accessories and consumables.
• 😀 The crawler rock drill is suitable for tiered areas and hard rock conditions, equipped with a 10-foot drill bit and a rotary compressor for air-powered drilling.
• 😀 The drilling geometry and blasting pattern play a crucial role in effective rock fragmentation, with factors like hole diameter, depth, and direction influencing the outcome.
• 😀 Blast hole depth should be adjusted to prevent protrusions on the floor of the ladder and ensure better fragmentation when drilled at an appropriate angle.
• 😀 Drilling patterns can be parallel or alternating, with alternating patterns providing better rock fragmentation due to more efficient energy distribution during blasting.
• 😀 The speed of drilling depends on the rock's hardness, the drill bit's diameter, and any obstacles encountered during the drilling process.
• 😀 Post-drilling checks ensure that the blast holes meet the planned specifications, including hole spacing, depth, slope, and the total number of holes, and that there are no obstructions.

Q & A

What is the primary aim of blasting activities in mining?

The primary aim of blasting activities is to dismantle hard rocks or minerals by using a mixture of chemicals to trigger an explosion in the rock mass.

What are the main stages of drilling in mining?

The main stages of drilling in mining are: checking the location, cleaning the location, measuring and providing stakes at the point to be drilled, and preparing the drilling equipment before use.

What is the role of the drilling machine in blasting operations?

The drilling machine is used to make blast holes in the rock mass. These holes are filled with explosives, which will be detonated during the blasting process.

What are the types of mechanical drilling systems used for drilling blast holes?

The mechanical drilling systems are divided into three types: percussive, rotary impact, and rotary percussion.

Why is the crawler rock drill chosen for drilling in hard rock conditions?

The crawler rock drill is used because it is highly suitable for tiered fields with hard rock textures. It is equipped with a drill bit and drill rod, and is supported by a rotary scrubbing-type compressor.

What is the purpose of measuring the spacing and depth of blast holes?

Measuring the spacing and depth of blast holes ensures that the drilling is done according to the planned geometry. It is crucial for proper fragmentation and effective blasting.

How does the type of rock affect the drilling process?

The type of rock greatly influences the speed and efficiency of drilling. Hard rocks like andesite require more energy and time to drill, making the process slower and more challenging.

What are the different drilling patterns used in mining?

Common drilling patterns in mining are parallel or alternating. The alternating drilling pattern produces better and more uniform rock fragmentation due to more optimal energy distribution during blasting.

What should be done if a drill hole is too deep or not deep enough?

If a drill hole is too deep, it should be filled with stemming material and compacted to the correct depth. If it is not deep enough, further drilling is required to reach the planned depth.

What safety measures are taken during the drilling activity?

The drilling equipment is positioned safely according to the procedure, and the driller must ensure the blast hole is made according to the planned geometry. Safety checks also involve inspecting drilled holes for obstacles and ensuring correct measurements.