Page 5 - MN 2020 Conference Program

MANAGEMENT 3:30pm
Mining Legacy on Pine Island
Chair: Larry Kramka; Foth Infrastructure & Environment, Julie Marinucci; St. Louis County, Hibbing, MN
LLC, Duluth, MN Historic mine workings from mining activity in the late 1800’s leave behind
two large mine shafts and a public safety concern. A collaborative effort
3:00pm led by St. Louis County worked to understand the history and mitigate the
Radical Productivity hazard.
Erika Garms, WorkingSmarts, Inc.
Radical Productivity addresses both time-saving and quality-building tech- 4:00pm
niques for getting more out of the hours you have.It involves learning not only Preventing TSF Failures with Design and Digital Monitoring
new mental habits, but also new physical and emotional habits. As it turns Techniques
out, we can’t be optimally productive if we leave out any one of those three Nathan Manser; Michigan Technological University, Houghton, MI
realms.Based on current research and tested on thousands of professionals
in a variety of industries, Erika will share the “Top 10 Activators of Radical Tailings Storage Facilities (TSF) are one of the most visible lasting signs of
Productivity” to show you exactly what you can do to boost your own produc- mining activities, that together with mine waste rock dumps and the ultimate
tivity, your staff’s, and to shape a high-performing work culture. open pit, are recognized as the “legacy” impacts of mining. TSF failure can
have disastrous consequences to nearby communities, the environment,
and to the mining companies, who may face high financial and reputational
3:30pm costs. This work presents an update on the latest TSF failures worldwide
Sustainability: Prosperity, People, Planet and links best practice design parameters with innovative digital sensing
Melissa Martinie, Carmeuse NA, Gulliver, MI techniques in an effort to reduce them.

4:00pm PROCESSING
Using Sustainability Tools to Certify Renewable Energy
Projects at a Mining Operation Chair: Brett Spigarelli; University of Minnesota Duluth,
Rachel Walker; Barr Engineering Co., Golden Valley, MN, Joffrey Wilson; Coleraine, MN
Mortenson MA, Golden Valley, MN and Matt Metzger; Barr Engineering
Co, Bloomington, MN 3:00pm
Mining operations, and the utilities that serve them, are increasingly explor- Bond Work Index – How Does it Work?
ing microgrid solutions and sustainability metrics to evaluate the options for Kyle Bartholomew; Metcom Technologies Inc., Grand Rapids, MN
power supply at mines. Grid connected mining operations have an opportu- Since its publication in British Chemical Engineering, 1960, Bond’s Third Law
nity to work with utilities to determine the best mix of energy that maximizes of Comminution has been used as a design, benchmarking, and optimization
cost savings and contributes to sustainability goals. Just as buildings can tool by metallurgists worldwide. This presentation is a refresher on the Bond
be evaluated and receive green building certification such as LEED, more Equation, and how it remains a powerful, standard method for evaluating
tools and processes are available to similarly evaluate large and complex grinding circuit performance, even as grinding equipment has evolved over
infrastructure projects, such as large mining operations, to include and plan the decades. The equation is broken down and explained to improve insight,
for renewable energy options. There are several types of tools and metrics. and to help avoid common mistakes, misapplications, and misconceptions
We examine a case study of a mining operation in Minnesota and consider about the Bond method
a range of options regarding a mix of energy supply including microgrid,
solar, wind, pump-storage and battery solutions. We present information
regarding how these tools are designed, the criteria they evaluate and mea- 3:30pm
sure, and some of the details regarding how projects receive certification. The Evolution of Primary Comminution Technologies and
Finally, we discuss how to effectively communicate results to a range of Improvements to Reduce Costs and Energy Consumption
stakeholders. Boyd Eisenbraun, Nick Sosalla and Dennis Murr; Barr Engineering Co.,
Hibbing, MN
RECLAMATION Crushing and grinding processes have undergone significant changes over
the last 20 years. These adjustments have focused on lowering costs, in-
Chair: Kris Benusa; Foth Infrastructure & Environment, creasing production, and improving energy efficiency. As technology con-
LLC, Lake Elmo tinues to change, the benefits and costs associated with each technology
needs evaluation for ore type and facility. Today, energy reduction for new
3:00pm and existing mine locations has become a significant factor in project eval-
Redeveloping Abandoned Quarries as Public Amenities uation. This presentation will review the current and historical technologies
Joel Asp; SEH, St. Cloud, MN used in primary grinding of ore and the energy consumption associated with
each technology with the goal of identifying possible opportunities to improve
Central Minnesota is known for its quantity and quality granite. Multiple and optimize the comminution processes.
granite companies have operated in the St. Cloud areas for decades. Aban-
doned granite quarries are present throughout the area and are becoming
community amenities versus waste areas. The City of St. Cloud restored a 4:00pm
680-acre area into Quarry Park and Nature Preserve with hiking, biking, The Applications of Electrical Resistance Tomography for
fishing, swimming and rock-climbing opportunities for the public. The City Multiphase Flows in Mineral Processing
of Waite Park used a 20-acre abandoned quarry and adjacent land donated Weiguo Xie; University of Minnesota, Duluth, MN
by the local quarry owner and created a 4000+ seat open air community The research aimed at solving the problem of measuring instantaneous local
amphitheater. This presentation will discuss the collective community and physical quantities for multiphase flows in mineral processing, which are com-
operations work together to repurpose these quarries through the planning, mon in minerals industry and with significant challenges. A compact Electrical
funding, and ownership aspects needed to make the areas into public, com- Resistance Tomography (ERT) probe was built and then used to measure within
munity amenities. a few flotation machines for the change of liquid content (high conductivity fluid
distribution) and turbulence energy distribution. ERT is a powerful technique
that has the potential to be used for a wider range of applications, such as
leaching process, high temperature flows in further downstream production
chain (steel making process and alloy manufacturing process).

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