Instance: mclaughlin_limit

mine picture
  1. Contents:
  2. Information
  3. File downloads
  4. Solution files
    1. UPIT
    2. CPIT
    3. PCPSP
  5. References

Information:

Description:
McLaughlin defunct gold mine located in CA, USA.
Limit pit (computed by provider) of mclaughlin instance
Block model:
2'140'342 blocks of size 25x25x20ft
Precedences computed with a 45 degrees pit slope (8 levels)
Blockfile columns detail:
id x y z blockvalue ton destination Au(oz/ton)
Blockvalue computation
UPIT & CPIT: precomputed using apriori destination
PCPSP: Computed using $900/oz (Au Price), $1.32/ton (mining cost), $19/ton (proc.cost) 90% (recovery)
Discount rate = 0.15
Type of Constraints:
C0 Capacity constraint (Mill): Total processed tonnage <= 3.3M tons

File downloads:

Download the Minelib data format specification.

Solution files:

UPIT

Download: mclaughlin_limit_upit.sol
Objective value: 1,495,726,474
Computed using Hochbaum's pseudoflow algorithm. [*]

CPIT

Download: mclaughlin_limit_cpit_gmunoz120723.sol
Objective value: 1,073,327,197 (LP GAP 0.5%)
Provided by Gonzalo Muñoz, and obtained from the LP relaxation using a modified TopoSort heuristic. [*]
Download: mclaughlin_limit.LPcpit
LP relaxation solution (not feasible)
Objective value: 1,078,979,501
Computed using a modified version of Bienstock & Zuckerberg algorithm. [*]

PCPSP

Download: mclaughlin_limit_pcpsp_gmunoz120723.sol
Objective value: 1,321,662,551 (LP GAP 0.2%)
Provided by Gonzalo Muñoz, and obtained from the LP relaxation using a modified TopoSort heuristic.[*]
Download: mclaughlin_limit.LPpcpsp
LP relaxation solution (not feasible)
Objective value: 1,324,829,727
Computed using a modified version of Bienstock & Zuckerberg algorithm.[*]

References:

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