Abstarct: Identifying the subsurface structures like cavities, mineral mines, historic rooms, streaks and mineral deposit is one of the most attractive majors for scientists in sciences like mine, geology, civil engineers and archaeologists. Determining the location of such structures only by data and surface geology information is impossible and it will be so complicated and over cost without geophysics methods. Therefore, in the beginning of an exploration work the geophysics methods can be used for such structures. One of the most prepare method to determine such phenomenon that have acceptable density contrast with their environment, is gravimetry method. In gravity data interpretation, after eliminating regional anomalies and preparing remaining maps, modeling is used to determine geometry parameters of corresponding structure. In this paper to identify and modeling mineral-educational coal tunnel named Dehmola, the operation of microgravity data on a part of main tunnel region (Adit) and perverted (Drift) has been done. After corrections and required processes, the regional data anomalies for modeling prepared. Furthermore for more investigation, the gravimetry data of an undersurface niches in the area of Nevada in the United States has been used. The Camacho linear inversion method is used to do modeling that has the ability of focusing inversion. To evaluate this method, the synthetics data of two horizontal parallelepiped prisms in two different depth has been used that the gained results have very good accommodation with depth and direction of two prisms. Due to complication of studied field, the results of modeling real data shows that a good separation between tunnels, drilled arises with surrounding area has been gained. Besides coal laxyers that are in direction of diversion tunnel (eastern-western) in very acceptable way identified and modeled. Also the harvest network properties, number of stations and data measuring accuracy can be very vital in getting a favorable and proper model.