نتایج جستجو برای: ultimate pit limit

تعداد نتایج: 229114  

Journal: :JPhys photonics 2021

Abstract Conventional classical sensors are approaching their maximum sensitivity levels in many areas. Yet these still far from the ultimate limits dictated by quantum mechanics. Quantum promise a substantial step ahead taking advantage of salient states to environment. Here, we focus on sensing rotations, topic broad application. By resorting basic tools estimation theory, derive that achieve...

Journal: :Interfaces 2014
W. Brian Lambert Andrea Brickey Alexandra M. Newman Kelly Eurek

A classical problem in the mining industry for open-pit mines involves scheduling the production of notional three-dimensional production blocks, each containing a predetermined amount of ore and waste. That is, given operational resource constraints on extraction and processing, we seek a net present value-maximizing schedule of when, if ever, to extract each block in a deposit. We present a v...

Journal: :Expert Syst. Appl. 2016
Shi Qiang Liu Erhan Kozan

In themining optimisation literature, most researchers focused on two strategic-level and tactical-level openpit mine optimisation problems, which are respectively termed ultimate pit limit (UPIT) or constrained pit limit (CPIT). However, many researchers indicate that the substantial numbers of variables and constraints in realworld instances (e.g., with 50–1000 thousand blocks) make the CPIT’...

Journal: :Microscopy and Microanalysis 2003

2013
W. B. Lambert A. M. Newman

n A common decision in openpit mining is to determine the extraction sequence of notional three-dimensional production blocks so as to maximize the net present value of the extracted orebody, while adhering to precedence and operational resource constraints. This openpit block sequencing (OPBS) problem is commonly formulated as an integer program, with binary variables representing if and when ...

Slope stability is one of the most important issues in open pit mining design. The main purpose of any open pit mine design is to propose an optimal excavation configuration, considering safety, ore recovery and financial return. An accurate pit slope design which accounts for the mine geology, structural geology, rock mass properties, and hydrogeology models of the mine area, drastically enhan...

2013
Daniel Espinoza

During early phases of open-pit mining production planning many parameters are uncertain, and since the mining operation is performed only once, any evaluations based only on on average outcomes neglects the very real chance of obtaining an outcome that is below average. Taking into account also that operation costs are considerable and the mining horizon usually extends over several decades it...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید