This paper points out the opportunities and needs for integration the maintenance function with other management systems in accordance with the requirements of ISO 9001, ISO 14001, OHSAS 18001 as well as the new Standard ISO 55001. It defines the flowchart of risk assessment in the procedure of mining equipment maintenance as well as the methodological framework for risk assessment in the procedure of mining equipment maintenance. The proposed risk assessment model defines the criteria for probability of occurrence the hazardous events as the consequences that may arise, as well as the mechanisms for control the assessed risk. This risk assessment model can be also put in the context of integrated risk management.

Gravity is considered as the basic physical force in the nature. Modern satellite missions: CHAMP, GRACE and GOCE allowed modeling of the global gravity field with very high accuracy, as well as its spatial and temporal variations. This paper describes the main objectives, characteristics, the latest results of these missions, as well as the expectations of the future observations, and their importance and contributions for the surveying and geodetic practice, and scientific achievements as well, in geodesy, geophysics and hydrology.

Explorations of the ore bodies Prlovi 1, Prlovi 2 and Z of the mined ore deposit Prlovi have included ore microscopy of mineral samples from many boreholes. The orebody Prlovi 2 is prospective for the lead (4%) and zinc (3%) concentrations of which 1.89% Pb and 1.58% Zn occur in sulphides and 2.17% and 1.44% in oxides. The purpose of the ore microscopy was to recommend, based on mineral composition and texture, how to enrich the complex sulphideoxide mineral. The paper describes the composition of the intergrown minerals and suggests the method of the mineral product recovery. Illustrations in the paper are good representative microphotographs of the identified and characteristic structural features.