IJE TRANSACTIONS B: Applications Vol. 30, No. 8 (August 2017) 1279-1287   

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GH. H. Kakha and M. Monjezi
( Received: May 14, 2017 – Accepted in Revised Form: July 07, 2017 )

Abstract    Push back design as a complex task, is one of the major steps in the open pit mines planning. Push backs can be generated by varying economic factors such as commodity price, mining cost, processing cost, etc. Another important issue in generating push backs is grade uncertainty, which can cause the problem be more complex. Conventional methods of push back design ignore grade uncertainty. To overcome this, “Grade Parameterization using Variance Algorithm” (GPVA) can be implemented. In this paper, an attempt was made to utilize GPVA in a hypothetical two-element deposit with the aim of minimization grade uncertainty effect on push backs design. Finally, the same example was solved using Whittle algorithm, the results indicate the superiority of the GPVA.


Keywords    push back, grade uncertainty, GPVA, two-element deposits


چکیده    طراحی پوش­بک به عنوان یک امر پیچیده، یکی از مراحل اصلی طراحی معادن روباز است، پوش­بک­ها را می­توان با استفاده از فاکتورهای اقتصادی همچون قیمت ماده معدنی، هزینه معدنکاری، هزینه فرآوری و غیره ایجاد کرد. از مسائل مهم دیگر در ایجاد پوش­بک­ها عدم­قطعیت عیار می­باشد، که می­تواند مسئله طراحی را پیچیده­تر کند. در روش­های سنتی طراحی پوش­بک، عدم­قطعیت عیار در نظر گرفته نمی‌شود. برای غلبه بر این مشکل، می­توان الگوریتم پارامترسازی عیار با استفاده از واریانس (GPVA) را اجرا کرد. در این مقاله، تلاش شده تا در یک ذخیره دو عنصره فرضی با استفاده از روش GPVA، طراحی پوش­بک­ها با هدف کمینه سازی اثر عدم­قطعیت عیار صورت پذیرد. در نهایت، همین مسئله با استفاده از الگوریتم ویتل نیز حل شد که نتایج حاصله نشان­دهنده برتری الگوریتم GPVA می­باشد.


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