Estimates are based on analyses of the data described above by experienced internal mining engineers, operating personnel and geologists. Property setbacks and other regulatory restrictions and limitations are identified to determine the total area available for mining. Data described previously are used to calculate the thickness of aggregate materials to be recovered. Topography associated with alluvial sand and gravel deposits is typically flat and volumes of these materials are calculated by applying the thickness of the resource over the areas available for mining. Volumes are then converted to tons by using an appropriate conversion factor. Typically, 1.5 tons per cubic yard in the ground is used for sand and gravel deposits. we have all the information you need about public and private plastic surgery clinics in vijayawada. compare all the plastic surgery clinics and contact the plastic surgeon in vijayawada who's right for you. Singamlingisa njani uJosefa kungakhathaliseki bona siqalene nani? (Qala iingaba 11-13)