By Monika Hardygóra; Gabriela Paszkowska; Marek Sikora

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5) If the original polygon is not the closed one, then process its start and end points.  If the answer is negative, then go to (8). (7) Delete 8­form polygon. (8) End of the algorithm.  The results indicate that the algorithms described in this paper works best when optimizing areas of gradually changing orientation. , 2001), more than ten frequently used graph algorithms have been successfully defined through countless tests and modifications, including border­line parallel push out and pull in, algebra operation on polygons, automatic drawing of visual slope lines and the drawing of polygons with sharing edge, etc.

A third step of this block search process is, therefore, set up to check out this group of blocks and re­estimate their mineability.  Low grade blocks are rejected from this screening process.  As discussed previously, the shared capital costs may vary from one block to another according to where the block is sitting in the orebody.  Those blocks that are rejected from this primary search process are recorded as marginal blocks for the next step of block search.  Neglecting the contribution from this group of blocks will not obviously lead to an incorrect solution to the total profit maximization problem.

In order to provide a more understandable approach to the cost assignment to the blocks, different cost terms are adopted in this paper.  Fixed costs are often given in dollars per annum. Block development capital costs (BDCC) refer to the capital costs of excavation and installation of the main drift section covering the mining block, the crosscuts or accesses, the raises located in this block, and other structures required by the specific mining method, such as undercut, drilling accesses, etc.

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