The key characteristics of the 500THD drilling rig are as follows:

1. Mounting: The 500THD drilling rig is truck-mounted, offering mobility and flexibility for transportation to various job sites.

2. Applications: Ideal for water wells, mineral exploration, and geophysical drilling, the 500THD is suitable for a variety of drilling projects in these fields.

3. Pullback Capacity: The rig has a rated pullback capacity ranging from no less than 6,000 kg (13,230 lbs) to no less than 10,000 kg (22,046 lbs), providing sufficient force for effective drilling operations.

4. Drilling Methods: Primarily designed for vertical diamond coring and rotary drilling, the rig supports various drilling techniques including air drilling, mud drilling, and D.T.H hammer drilling when fitted with suitable options.

5. Drilling Specifications:
   - Open Hole Diameter: Ranging from 120mm (4-3/4") to a depth of 350m (1148 ft).
   - Coring Capacity: HQ size to a depth of 500m (1640 ft).
   - Pulldown Force: 7300 kg (16,060 lb).
   - Pullback Force: 7300 kg (16,060 lb).
   - Variable Head Speeds: Head low speed ranges from 0 to 146 RPM, with corresponding torque rating of 428 Kg/m (3199 lb/ft); head mid 1 speed ranges from 0 to 241 RPM, with corresponding torque rating of 168 Kg/m (1216 lb/ft); head mid 2 speed ranges from 0 to 650 RPM, with corresponding torque rating of 78 Kg/m (578 lb/ft); head high speed ranges from 0 to 1100 RPM, with corresponding torque rating of 48 Kg/m (350 lb/ft).
   - Winch Capacity: 6000 kg.
   - Coring Pump: W-11.

Overall, the 500THD drilling rig offers robust pullback capacity, versatile drilling methods, and adaptability to various drilling applications, making it suitable for water wells, mineral exploration, and geophysical drilling projects.

"Hydraulic top-head drive drills" refers to drills that utilize a hydraulic top-head drive system. These drills employ hydraulic pressure to drive the main power head located at the top of the drill, enabling the rotation of the drill bit for drilling operations. Hydraulic top-head drive drills are widely used in various fields such as geological exploration, water well drilling, and foundation engineering. These drills are typically designed to be mobile, allowing for easy installation on trucks, excavators, or other vehicles, facilitating drilling operations at different locations. Due to their efficient hydraulic drive system providing effective power transmission and precise control, hydraulic top-head drive drills are extensively utilized in various drilling applications.