Collapse of earth into underground mines, or subsidence, is a serious problem. In room-and-pillar and long-wall mines, columns of coal and other structures are used to support the ground above. Later in the mining process, they are often taken out. The mines are left to collapse.
We view overhead as two types of costs and define them as follows: Manufacturing overhead (also referred to as factory overhead, factory burden, and manufacturing support costs) refers to indirect factory-related costs that are incurred when a product is manufactured.
Definition. Indirect expenses associated with processes used to produce a good or service. Production overhead may include expenses such as stationery, utilities, support staff salaries, and rent or other facilities costs.Finding ways to reduce production overhead is a frequent technique for improving the efficiency and profitability of production.roduction overhead may include expenses such as stationery, utilities, support staff salaries, and rent or other facilities costs.