Wk 1.2 Theory of constraints applied to mining Flashcards
What is TOC
Theory of Constraints
Where did TOC originate from
From the manufacturing sector and is now applied to mining
What are process maps
a way of documenting the sequence of tasks and when it occurs
What do the following shape symboles correspond with on the map:
Circle -
Square/rectangle -
arrow -
diamond -
semi circle -
torn page -
Circle - beginning or end
Square/rectangle - activities
arrow - process flow direction
diamond - decision
semi circle - delay
torn page - document
What does takt mean in german
a baton that an orchestra conductor uses to regulate the tempo of the music
What is takt time
it is though of as a measurable “beat time”, “rate time” or “heartbeat”.
In manufacturing what is takt time
it is the rate at which a finished product needs to be completed in order to meet customer demands
What does lean manufacturing come from
toyota production system in the 1980s and is now used in mining
What is the equation for takt time
takt time = working time available/customer demand
what changes in the takt time equations for mining
the customer demand can be completed in tonnes or loads
How can a bottle neck be determined
when the cycle time exceeds the takt time and is a larger quantity than other process it is seen to be a bottle neck as it takes a longer period of time
When implementing continous improvent processes where should the money be allocated
it should go towards the bottlennecks of the operation
What is rate in terms of takt time
rate is the inverse of takt time
what is the equation for volume produced
mean rate X production time
what is used instead of takt time in mining
production time
what is the equation for production time
available time X utilisation X calander hour availability
what is mean rate
the average rate that is able to be produced
how can the volume produced by a mine be increased
increasing the productioin time
this can be done through increaseing availability and/or utilisation
What is MDR
Maximum Demonstrated rate
what does the variance in production rate show
The difference between the top point of the MDR and the mean rate.
Where does inherent variability in production come from
the variance
What is the goal rate to sustain
the aim is to maintain the highest demonstrated rate
Where are challenges in increasing the production rate come from.
Challenges come from the variance in rate aims to understand where it comes from and how it can be stabilised.
Other challenges are how to push the whole rate towards MDR
What is a current initiative to increase a production rate (increase truck rate)
increase in truck payload where the main variable when keeping the same truck but increasing the load is the tire type.
