In copper heap leaching structures, the ore is leached by an acidic solution. After dissolving the ore mineral, the heap is drained off in the acidic solution using a drainage system (consisting of a network of perforated polyethylene pipes and gravelly drainage layers) and is, then, transferred to the leaching plant for copper extraction where the copper is extracted and the remaining solution...

Earlier analyses of valley networks on Mars often concluded that they were poorly integrated, immature drainage systems. Consequently, surface runoff from precipitation was generally thought to be an unimportant geomorphic process. Combination of Mars Global Surveyor (MGS) imaging and altimetry data sets, however, provides a vast improvement in image clarity and resolution. Although we have use...

abstract one of the ways to increase economic and environmental efficiency of drainage systems is water table management. water table management consists of, controlled drainage and subirrigation. this study examines the effect of controlled drainage on yield, root distribution pattern and water use efficiency of maize (sc 704) in karaj. the experiment was performed as a randomized complete des...

Background & Importance: Chronic subdural hematoma (CSH) is one of the most frequent intracranial hemorrhages in adults. However, gold standard treatment of CSH is not yet defined. Since the 80’s, closed drainage is a standard among techniques using drains because the open type has been incriminated in high rates of postoperative infections. However, closed drainage requires mat...

Abstract Performance forecasting of multi-fractured horizontal wells (MFHWs) completed in tight/shale oil or gas reservoirs is great significance the development unconventional resources. Dynamic drainage area (DDA) concept has emerged as a production methodology for reservoirs. This paper investigated DDA method and derived correct expressions distance investigation (DOI) both constant rate bo...

Gas control in the heading face of a coal roadway is an important and difficult point mining China. On basis analyzing disadvantages high gas cost long drainage period existing mine face, long-distance pre-drainage method drilling proposed to so as improve tunneling speed. Applied engineering geological conditions Changcun mine, technology studied detail. First, migration model considering perm...

background the incidence of prostatic abscess (pa) has markedly declined with the widespread use of antibiotics and the decreasing incidence of urethral gonococcal infections. objectives to evaluate different treatment methods for prostatic abscess and to describe technical points that will improve the outcome of transurethral (tur) drainage of prostatic abscess. patients and methods we perform...