Ultra-fast Pit Optimiser
GeoMine FlowPit (FlowPit)is a ultra-fast pit optimization software. FlowPit implements the industry standard Lerchs-Grossmann’s 3D pit optimization algorithm, but with a novel implementation. FlowPit’s highly efficient and scalable implementation achieves a superior magnitude speed-up in comparison to competitors. For small block models (with about 1 million non-air blocks), FlowPit takes seconds to complete a single optimization run as opposed to hours. For very large block models (with 15~30 million non-air blocks), FlowPit takes full advantage of today’s multi-core CPUs to determine the optimum final pit limit within half an hour. For huge block models (with 50~100 million non-air blocks), without super-blocking, FlowPit Ultimate can determine the optimum pit limit within 3 hours on modern i7 PCs equipped with 32gb ram.
In order to arrive at a solution in a realistic time frame for large block models, most of the existing mine planning software for open pit mining (pit optimisers) use super-blocking to drastically reduce total block counts. Consequently, this materially affects the solution accuracy which has not been quantifiable up until now. Usually a single careless 2x2x2 reblocking can result in a final pit with up to 7% profit loss and a slight pit slope change (please refer to the Impact of Reblocking on Pit Optimization for a detailed analysis). With FlowPit, mine planners no longer need to super-block their block model and even if they do, they now have a proper tool to evaluate the impact of their chosen reblocking configuration on their block model. This advance in computational speed with guaranteed optimality makes FlowPit an effective tool not just for determining the optimal pit limit, but also for Sensitivity Analysis that allows the planner to quickly conduct reliable “what if?” scenario analyses.
FlowPit Key Benefits
FlowPit Feature List
(for creating schedules that either maximize NPV or meeting the production rates with iScheduler).
(via the free GeoMine Foundation module) allows the user to detect and correct potential errors in the input block model before optimisation starts.
allows maximum flexibility in report generation without custom scripting.
with more than 30 mil non-air blocks
(property lines that must not be crossed) can be specified as polylines in a DXF file.
Two types of nested pits can be generated: LG nested pits for creating LOM schedules with maximal NPV and equal-sized geologically optimum nested pits for creating smooth schedules with relatively constant production rate. (Pushbacks and/or Schedules must be created with iScheduler, FlowPit only generates nested pits as input to iScheduler)
Output to CSV format and to DXF format
Exploiting parallelism on multi-core CPUs for ultimate performance.
(made possible by a powerful cell scripting engine) supports multi-minerals, stockpiling options, partial block calculations as well as unlimited user conditions or constraints. FlowPit’s Cell Scripting Engine opens a door to virtually infinite possibilities for mine planners that make a difference.
Slope angle can vary by rock types, by sectors and/or by levels.
Option to normalize and reblock input block model if needed.
Supports a large range of ASCII file formats exported by all General Mining Packages including ThreDify CoreBlock and ThreeDify GeoModeler.
Built-in real-time 3D viewer of final and nested pits.
Sensitivity analysis allows the user to see the impact of changes to any variable (price, costs) on the NPV of the project, as well as the impact of geological uncertainty.