Managing Director & Senior Partner
Lean principles and practices have been in vogue for decades, revolutionizing productivity in a number of industries, notably automotive. So it’s not surprising that many mining companies have tried to launch lean initiatives. Yet many lean programs in mining deliver incremental improvements for only a few months, after which things return to “normal.”
The mining industry has unique characteristics that make applying lean particularly challenging, such as diverse and difficult working conditions, unpredictable distances, and remote locations.
We have run more than 100 lean programs with mines over the last few decades, across the Americas, Australia, Asia-Pacific, Africa, and Europe. In our experience, miners that get the most value from lean excel on three fronts:
One common lean method that brings the above three imperatives together is takt-based production planning.1 Notes: 1 Takt, derived from the German word Taktzeit, translates to a period or cycle and is a unit of time used to set the pace for production lines. Takt planning is most common in production lines that move a product along a line of stations, each of which performs a set of predefined tasks. Takt planning is critical for sustaining productivity increases in mines because it helps to simplify lean concepts for shop floor application. Takt planning is relevant in mining for three reasons.
First, in mining, as in assembly lines, a specific sequence of activities must be carried out for production at each rockface or stope—from drilling and blasting to hauling, crushing, and hoisting.
Second, the time taken for mining activities can be broken down into standard time slots, irrespective of geology and operating conditions; we realized this when we analyzed the geologies of mines across Africa, Asia, and Europe.
Third, coordination of resources across stopes accounts for significant lost productivity in mines. That’s because conditions differ at each site. For example, at an African polymetallic mining client, coordination delays accounted for more than 40% of lost productivity. (See Exhibit 1.) Takt planning helps to better sequence activities, thus reducing delays.
When applied correctly, takt planning can boost mine productivity by 15% to 20%, and keep it there. For example, in an Indian zinc mine we worked with, we helped unlock 15% to 30% more blasts per day by making intrashift gaps between mining activities more visible to production planners.
How can you best use takt planning to boost productivity at the rockface? Drawing on our work with various mines, we have identified six golden rules, in three categories, for making productivity improvements stick:
As you apply the golden rules, beware of common pitfalls that can cause them to backfire. These include skepticism from shop floor workers and planners, difficulty in optimizing shifts because of variability in operating conditions, and isolation of takt planning to just one department. The following tips can help you avoid these pitfalls.
Assign a master planner. Designate a master planner to collect relevant information for planning, to craft plans, and to communicate them to production managers and workers at each stope. As needed, help your senior mine planner make the transition from the traditional shift-based planning mindset to a takt-based microplanning mindset. For example, in one mine, we won over the planner by explaining how takt planning helped increase the number of blasts per day.
Use clear, compelling visual aids. Resist any temptation to use overly sophisticated visual aids (such as electronic boards) to depict takt plans and actual production activity for workers and managers. We found that one simple but engaging board, using colored magnets, galvanized shop floor workers more than many fancy production status boards.
Involve the shop floor. To win further buy-in for takt planning, involve workers, from both engineering and operations. While such “silo busting” may initially strike workers as strange, they’ll likely grow more comfortable with it if you set up regular cross-functional meetings about takt plans.
This article was first published in Mining Journal on July 24, 2015.
Miners can supercharge productivity at the rockface by implementing takt-based production planning. What’s more, success on this front can form the bedrock for deployment of a larger lean program. However, to capture these benefits, miners will need to avoid all-too-common pitfalls—as well as unite people from different functions behind the effort.