Life Cycle of a Mine: From Planning to Rehabilitation
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Life Cycle of a Mine: From Planning to Rehabilitation

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The following content is sponsored by Natural Resources Canada.

Mine Closure and Rehabilitation

Life Cycle of a Mine: From Planning to Rehabilitation

View the full-size infographic by clicking here.

Mining provides the critical minerals and metals needed for modern society to function. However, if these resources are not properly managed, mining activity can impact local environments and biodiversity.

For this reason, the mines of today prepare for a rehabilitated landscape right from the beginning, in a process known as “progressive reclamation”.

Today’s infographic comes to us from Natural Resources Canada, a government entity which funded the development of the Canadian Minerals and Metals Plan that supports sustainable mining practices throughout its lifecycle.

What is Progressive Mine Reclamation?

The process of progressive reclamation, also known as rehabilitation, plans for post-closure activities during the mining process, from before the first bit of dirt is moved to when the last truck leaves the mine.

There are three stages to the mining process, each with their own associated activities to plan for mine reclamation.

  1. Before Mining: Integrated mine planning for closure and reclamation
  2. During Mining: Planning for climate change impacts and land use
  3. After Mining: Closure and reclamation

While these are distinct stages, three continuous processes occur throughout the sequence of the mining life cycle:

  • Continuous monitoring
  • Continuous engagement with Indigenous Peoples, communities, and regulators
  • Continuous updates to ensure closure and reclamation plans complement any modifications to the mine plan

  • Each process is meant to be inclusive, continuous, and responsive to the constantly changing environment to ensure there is flexibility and preparedness to adapt as necessary.

    1. Before Mining

    The rehabilitation process starts before mining begins. The permitting process for mine development requires closure and reclamation plans.

    2. During Mining

    An area of the mine can be reclaimed even as other parts of the mine are in operation. Mitigating the impacts of land disturbance during operations are critical to return the land to a viable state.

    Climate change impacts can affect operations, and mine operators should account for this in ongoing processes to ensure successful closure and reclamation.

    Water treatment facilities process surface and mine waters to ensure compliance, water recycling, and watershed management. This is all under the eye of continuous monitoring of the movement of earth and materials.

    3. After Mining

    Once the mining process is complete, mining companies can return the land to a natural state and prepare for post-closure reuse. Mine closure and rehabilitation activities need to take local environmental conditions into account. Evidence of the mining operation must be removed as much as possible.

    Part of this process means the continued relationship with the people, community, and lands affected. Mining companies can re-purpose for other uses, including:

    • Agriculture
    • Solar panel farms
    • Biofuel production
    • Recreational and tourist use

    By incorporating local and traditional knowledge into planning and working with Indigenous Peoples and communities, modern practices and local knowledge can restore the land in a way that also brings benefits to the local community.

    The Canadian Minerals and Metals Plan

    Mining operations can generate opportunities for new businesses to create local benefits. Reverting mines to a rehabilitated state will ensure that the landscape can continue to support life for centuries to come.

    The Canadian Minerals and Metals Plan supports this vision of progressive mine rehabilitation, to ensure Canada remains a responsible mining powerhouse for generations to come.

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Ranked: Emissions per Capita of the Top 30 U.S. Investor-Owned Utilities

Roughly 25% of all GHG emissions come from electricity production. See how the top 30 IOUs rank by emissions per capita.

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Emissions per Capita of the Top 30 U.S. Investor-Owned Utilities

Approximately 25% of all U.S. greenhouse gas emissions (GHG) come from electricity generation.

Subsequently, this means investor-owned utilities (IOUs) will have a crucial role to play around carbon reduction initiatives. This is particularly true for the top 30 IOUs, where almost 75% of utility customers get their electricity from.

This infographic from the National Public Utilities Council ranks the largest IOUs by emissions per capita. By accounting for the varying customer bases they serve, we get a more accurate look at their green energy practices. Here’s how they line up.

Per Capita Rankings

The emissions per capita rankings for the top 30 investor-owned utilities have large disparities from one another.

Totals range from a high of 25.8 tons of CO2 per customer annually to a low of 0.5 tons.

UtilityEmissions Per Capita (CO2 tons per year)Total Emissions (M)
TransAlta25.816.3
Vistra22.497.0
OGE Energy21.518.2
AES Corporation19.849.9
Southern Company18.077.8
Evergy14.623.6
Alliant Energy14.414.1
DTE Energy14.229.0
Berkshire Hathaway Energy14.057.2
Entergy13.840.5
WEC Energy13.522.2
Ameren12.831.6
Duke Energy12.096.6
Xcel Energy11.943.3
Dominion Energy11.037.8
Emera11.016.6
PNM Resources10.55.6
PPL Corporation10.428.7
American Electric Power9.250.9
Consumers Energy8.716.1
NRG Energy8.229.8
Florida Power and Light8.041.0
Portland General Electric7.66.9
Fortis Inc.6.112.6
Avangrid5.111.6
PSEG3.99.0
Exelon3.834.0
Consolidated Edison1.66.3
Pacific Gas and Electric0.52.6
Next Era Energy Resources01.1

PNM Resources data is from 2019, all other data is as of 2020

Let’s start by looking at the higher scoring IOUs.

TransAlta

TransAlta emits 25.8 tons of CO2 emissions per customer, the largest of any utility on a per capita basis. Altogether, the company’s 630,000 customers emit 16.3 million metric tons. On a recent earnings call, its management discussed clear intent to phase out coal and grow their renewables mix by doubling their renewables fleet. And so far it appears they’ve been making good on their promise, having shut down the Canadian Highvale coal mine recently.

Vistra

Vistra had the highest total emissions at 97 million tons of CO2 per year and is almost exclusively a coal and gas generator. However, the company announced plans for 60% reductions in CO2 emissions by 2030 and is striving to be carbon neutral by 2050. As the highest total emitter, this transition would make a noticeable impact on total utility emissions if successful.

Currently, based on their 4.3 million customers, Vistra sees per capita emissions of 22.4 tons a year. The utility is a key electricity provider for Texas, ad here’s how their electricity mix compares to that of the state as a whole:

Energy SourceVistraState of Texas
Gas63%52%
Coal29%15%
Nuclear6%9%
Renewables1%24%
Oil1%0%

Despite their ambitious green energy pledges, for now only 1% of Vistra’s electricity comes from renewables compared to 24% for Texas, where wind energy is prospering.

Based on those scores, the average customer from some of the highest emitting utility groups emit about the same as a customer from each of the bottom seven, who clearly have greener energy practices. Let’s take a closer look at emissions for some of the bottom scoring entities.

Utilities With The Greenest Energy Practices

Groups with the lowest carbon emission scores are in many ways leaders on the path towards a greener future.

Exelon

Exelon emits only 3.8 tons of CO2 emissions per capita annually and is one of the top clean power generators across the Americas. In the last decade they’ve reduced their GHG emissions by 18 million metric tons, and have recently teamed up with the state of Illinois through the Clean Energy Jobs Act. Through this, Exelon will receive $700 million in subsidies as it phases out coal and gas plants to meet 2030 and 2045 targets.

Consolidated Edison

Consolidated Edison serves nearly 4 million customers with a large chunk coming from New York state. Altogether, they emit 1.6 tons of CO2 emissions per capita from their electricity generation.

The utility group is making notable strides towards a sustainable future by expanding its renewable projects and testing higher capacity limits. In addition, they are often praised for their financial management and carry the title of dividend aristocrat, having increased their dividend for 47 years and counting. In fact, this is the longest out of any utility company in the S&P 500.

A Sustainable Tomorrow

Altogether, utilities will have a pivotal role to play in decarbonization efforts. This is particularly true for the top 30 U.S. IOUs, who collectively serve 60 million Americans, or one-fifth of the U.S. population.

Ultimately, this means a unique moment for utilities is emerging. As the transition toward cleaner energy continues and various groups push to achieve their goals, all eyes will be on utilities to deliver.

The National Public Utilities Council is the go-to resource to learn how utilities can lead in the path towards decarbonization.

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The Road to Decarbonization: How Asphalt is Affecting the Planet

The U.S. alone generates ∼12 million tons of asphalt shingles tear-off waste and installation scrap every year and more than 90% of it is dumped into landfills.

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Road to Decarbonization - How Asphalt is Affecting the Planet

The Road to Decarbonization: How Asphalt is Affecting the Planet

Asphalt, also known as bitumen, has various applications in the modern economy, with annual demand reaching 110 million tons globally.

Until the 20th century, natural asphalt made from decomposed plants accounted for the majority of asphalt production. Today, most asphalt is refined from crude oil.

This graphic, sponsored by Northstar Clean Technologies, shows how new technologies to reuse and recycle asphalt can help protect the environment.

The Impact of Climate Change

Pollution from vehicles is expected to decline as electric vehicles replace internal combustion engines.

But pollution from asphalt could actually increase in the next decades because of rising temperatures in some parts of the Earth. When subjected to extreme temperatures, asphalt releases harmful greenhouse gases (GHG) into the atmosphere.

Emissions from Road Construction (Source) CO2 equivalent (%)
Asphalt 28%
Concrete18%
Excavators and Haulers16%
Trucks13%
Crushing Plant 10%
Galvanized Steel 6%
Reinforced Steel6%
Plastic Piping 2%
Geotextile1%

Asphalt paved surfaces and roofs make up approximately 45% and 20% of surfaces in U.S. cities, respectively. Furthermore, 75% of single-family detached homes in Canada and the U.S. have asphalt shingles on their roofs.

Reducing the Environmental Impact of Asphalt

Similar to roads, asphalt shingles have oil as the primary component, which is especially harmful to the environment.

Shingles do not decompose or biodegrade. The U.S. alone generates ∼12 million tons of asphalt shingles tear-off waste and installation scrap every year and more than 90% of it is dumped into landfills, the equivalent of 20 million barrels of oil.

But most of it can be reused, rather than taking up valuable landfill space.

Using technology, the primary components in shingles can be repurposed into liquid asphalt, aggregate, and fiber, for use in road construction, embankments, and new shingles.

Providing the construction industry with clean, sustainable processing solutions is also a big business opportunity. Canada alone is a $1.3 billion market for recovering and reprocessing shingles.

Northstar Clean Technologies is the only public company that repurposes 99% of asphalt shingles components that otherwise go to landfills.

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