Open pit test

The following four fragmentation tests have been u sed at Aberdeen Proving Ground (Ref 1) A)Closed Pit (orChamber) Test B)Open Pit Test C)Panel Test and D)Veloe ity of Fragments Test, whereas the closed pit test has been used at PicArsn. All of these tests are briefly described below ... 

B. Open Pit Test. This test is designed for the purpose of recovering a portion of the fragments of detonated bomb in such a manner rfcat they will be segregated into groups which correspond to various areas of the bomb -bpdy, nose or tail... 

In the open pit test only a small portion of the fragments hit the pit area, but since the angle subtended by the pit and the height of suspension are known, it is possible to compute all the info that can be obtained in a closed pit test... 

Open pit test may be conducted in conjunction with panel and fragment velocity tests (Ref 2, pp4-6) (See Fig under Panel Test)... 

There are four general types of fragmentation tests used by US Ord Dept enclosed Chamber or Pit Test. b)Open Pit Test, c)Panel Test, and d)Velociry Measurement Test. The Closed Chamber Test, as conducted at Picatinny Arsenal, is described in detail in Ref 7. The other three tests, as conducted at Aberdeen Proving Ground, are described in Ref 6. More information on fragmentation will be given in Vol III, under F Refs l)Stettbacher(1933),50-1 St 218-19 2)L.V.Clark,IEC 25, 1389-90( 1933) 3)A.Majrich F.Sorm,... 

The former Soviet Union constmcted a 262-km, 508-mm dia experimental coal slurry line between the Belovo open-pit coal mine in Siberia s Kuznets basin to an electric power plant at Novosibirsk, using technology developed by Snamprogetti. Testing began in late 1989 and tentative plans call for constmction of two much larger slurry pipelines, each 3000-km long, with capacity to move a total of 33 x 10 t/yr to industrialized areas near the Ural Mountains (27,33). 

Because the ore quaUty is variable, large open-pit mining areas are first identified by general exploration specific mining strips are later identified by further exploration and testing. Surface mining methods are used. The overburden is drilled, blasted, and removed, and the waste from a given strip is dumped into a previously worked-out strip. After removal of the overburden, the exposed caUche is drilled, blasted, and loaded into 80-metric ton tmcks that dehver the ore to a transfer rail station for transportation to the plants. 

Effect of degree of fatty acid mixture dispersion on Cu/Co flotation from siliceous Kolwezi open pit ore - laboratory-locked cycle tests... 

Open Pit "Panel Pit Methods, "Low Panel "High Panel Tests and "Silhouette Test in Vol 3, pp C345 to C350-R. 

In the early 1990s a new copper extraction technology, known as in situ leach mining, was under investigation. This methodology was proposed, and demonstration plants were lo be constructed to test the proposal. These were jointly sponsored projects by the U.S. Bureau of Mines and two mining companies. If successful, leaching would cut ihe costs and hazards of the traditional open-pit methods currently used. 

The procedure for combined open pit-, panel- and fragment velocity testing is given in Ref 3, pplO-11... 

For conducting this test, the bomb or proj is suspended, unfuzed, on the gallows in the same manner as in conducting the Open pit or panel tests, previously described. An... 

---