Heavy equipment is a large machine designed to carry out construction functions such as earthworks and moving building materials. Heavy equipment generally consists of five components, namely implements, traction devices, structures, power sources and transmissions, and control systems.

Nickel is a metallic chemical element in the periodic table that has the symbol Ni and atomic number 28. Nickel is a silvery-white metal with a slight golden tint. Nickel is a transition metal, and has hard and ductile properties.

Coal is one of the fossil fuels. The general understanding is sedimentary rock that can be burned, formed from organic deposits, mainly plant remains and formed through the process of coalescence. Its main elements consist of carbon, hydrogen and nitrogen and oxygen

Land clearing is the activity of opening new land for rice fields, fields and community gardens including maintenance and cleaning using modern and sophisticated tools and equipment such as bulldozers, tractors etc.

Road infrastructure is a locomotive for driving economic development not only in urban areas but also in rural areas. In addition, infrastructure is a pillar that determines the smooth flow of goods, services, people, money and information from one market zone to another.

Jetty is a building perpendicular to the beach placed on both sides of the river mouth which serves to reduce siltation of the channel by coastal sediments. In the use of river mouths as shipping lanes, sedimentation in estuaries can disrupt ship traffic.

Irrigation or watering is an effort made by humans to irrigate agricultural land. In the modern world, there are currently many models of irrigation that can be done by humans. with the aim to provide moisture that is useful for plant growth.

Construction is an activity to build facilities and infrastructure. In a field of architecture or civil engineering, a construction is also known as a building or infrastructure unit in an area or in several areas.