BLENDED TAILINGS AND WASTE ROCK (With a tip o’ the hat to Andy Rudy)Individually, tailings and waste rock usually have some characteristics that could be improved upon. For example, waste rock often has a high amount of void space between the rock particles, which we[…]

Quite a few people have commented to me about my blog, saying that they really enjoyed this article or that one. It always feels good when people recognize (or at least acknowledge) my work. It makes me feel like the effort matters. A dear friend[…]

I know. The expression is supposed to be, “A Diamond is Forever”. Thank you De Beers, but that really isn’t true. Not to knock too much of the luster off of the very famous slogan, but take the example of industrial diamonds that are used[…]

A very dear friend of mine is suffering from a type of blood-borne cancer that is very similar to leukemia. In her particular case, she needs a blood donor so they can harvest a certain type of stem cells (peripheral blood stem cells) that will[…]

The holidays are for family time. Sharing a laugh, sharing love, sharing a meal, and sharing gifts. And having the gift of each other’s company. This Christmas was a little different, as we traveled to Portland, Oregon to visit my daughter, Stephanie. Stephanie has lived[…]

Well… sorry, but I’m mailing this one in. I have come across several people in mining who are beginning to move the needle, but for this one, I am going to take a weak fallback, and include only those who have been inducted into the[…]

This blog has been written with the prompting of my good friend, Dawn. At a lot of sites around the world, tailings are re-mined and re-processed.  When I was living in South Africa (1999 to 2003), I worked on a very large project where tailings[…]

That is one of my favorite expressions. I think that I made it up. If I didn’t, I wish I had.   The “saved” money almost always gets used elsewhere.  Either in the design or in the construction. What am I talking about? Well, it’s[…]

Oprah Winfrey. According to Wikipedia, Oprah Winfrey is an American media executive, actress, talk show host, television producer and philanthropist. By 19, she was a co-anchor for the local evening news. She is best known for her talk show The Oprah Winfrey Show, which was[…]

According to their website, The U.S. Department of Labor’s Mine Safety and Health Administration (MSHA) works to prevent death, illness, and injury from mining and promote safe and healthful workplaces for U.S. miners. MSHA carries out the provisions of the Federal Mine Safety and Health[…]

Jeff Bezos is well-known as being the founder of Amazon. He graduated from Princeton University in 1986 with degrees in electrical engineering and computer science. He then worked on Wall Street in a variety of related fields until early 1994. Then he founded Amazon. Amazon[…]

On Thursday October 19th, it was my pleasure to once again host the Elko Roundtable. My co-host for the event was my good friend Rick Frechette. My little joke was that I was the host and he was the co-host. This year, the gathering was[…]

The following text is based on a previously unpublished article that I authored in 1995. I’ve made only very minor edits to the original version, and that was only to add a few things here and there. In this day and age, with the aid[…]

There are many people in the world who give me inspiration. Some are bold people who kick ass at everything they touch. Some are people who are at the top of their industry. They not only inspire, but also motivate me. The list is not[…]

I had my first professional publication more than three decades ago. That was at the US Bureau of Mines. I’ve told you about that previously. Since then, I have been published about three dozen more times. A list of most of those publications can found[…]

Now if I tell you that you suffer from delusions. You pay your analyst to reach the same conclusions. You live your life like a canary in a coalmine. You get so dizzy even walking in a straight line. Canary in a coalmine. Canary in[…]

The 1981 movie, “Neighbors” is the story of one man’s quiet suburban life which takes a sickening lurch for the worse when a young couple move into the deserted house next door. From the word go it is obvious these are not the quiet professional[…]

Mr. Musk. You are a risk-taker and a visionary. You are a talented team-builder. Are you ready for a new challenge? I know you’re working on mining in space, but are you really ready? SpaceX has had many firsts. SpaceX’s achievements include sending the first[…]

In-Pit Disposal of Filtered Tailings I’ve written briefly on filtered tailings in other blogs. To re-cap, filtered tailings have the approximate consistency of used, wet coffee grounds from a drip coffee maker. Filtered tailings can be delivered to the TSF by conveyor or truck. Filtered[…]

In Uzbekistan, they celebrated several different new year events. I wish I’d been warned about one in particular. I was at the apartment alone one night, when there was a knock on the door. A group of kids were there. They said something, and threw[…]

Oh, I forgot one story about my first trip to Uzbekistan. My roomie and I had an ongoing contest. It was to find the weirdest thing in a store. One day, I was walking along and found a store I had never seen before. In[…]

The Muruntau gold deposit is in the Kyzyl Kum Desert of Uzbekistan. It is being mined in the world’s largest open-pit gold mine with production of about two million ounces a year. The gold ore resource in the Muruntau deposit, including past production, is about[…]

The Bureau had some real characters. One such character was Iggy. Iggy was a Slovak, and he loved to regale us with his stories. One story involved the “lipstick” factory that he had worked in during the war. Right, Iggy, a lipstick factory. You need[…]

Okay, now back to the story. It’s the story of my first job after college, remember?  When I left college to work for the Bureau, I was a 2-week field camp class away from earning a B.S. degree in geological engineering. After being there for[…]

Okay, I don’t really think that this is an origin story, but it is the story of my first job after college. Maybe it was more of a metamorphosis. But first, some back story. I was in the undergraduate mining engineering program at New Mexico[…]

The California goldrush of the latter part of the 1800s, and later in Colorado and other western states, is a prime example of many things. Man’s quest for treasure. Man’s need for adventure. Man’s ability to overcome extreme odds. And the thought that the American[…]

How many types of tailings facilities are there? How many stars are there in the night’s sky? How many licks does it take to get to the center of a Tootsie Pop? Okay, maybe not that many, but there are a lot, because each one[…]

If you have a degree in geotechnical engineering, being involved with the design of mine waste (and heap leach) facilities is a natural fit. There are very few aspect of geotechnical engineering that are not used for the design of a tailings facility. Well, in[…]

Following a couple of stints in the US Marine Corps (thank you for your service), working as a cook and a hod carrier (Google that!), my dad settled on being a business man. First working at a travel agency, then owning his own, later building[…]

First, what is mining? Mining is the extraction of rocks (stone) or minerals from the earth. Some mineralized deposits are of economic interest to the miner or mining company. Products recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, salt, gravel, dimensional stone,[…]

Lunar mining? What in the world? Have we already depleted this planet to such a point that we need to begin exploiting other celestial bodies? Nope! But is it real? And is it needed? Let’s find out! There are three primary potential resources existing on[…]

My friend, who I will call “Joe” was commenting to me about my blog, and how Joe has found some of the articles to be especially helpful for non-technical people. Joe mentioned to me that a non-technical article on static liquefaction would be very helpful.[…]

The year was 1985, or there-about. I was in the ground control group at the US Bureau of Mines in Denver. Somebody referred to us as the bolt boys. I wrote this semi-satirical hop-hop song in response. The recording was done by my friend Clay[…]

A few weeks ago, a friend of mine was commenting on my blog, and said that I shouldn’t be afraid to change things up.  Post a recipe, or whatever.  Thanks Steve.  Here is a change-up. It was the winter of 2009, just after New Year’s[…]

 It seems like impossible things happen all the time.  As a breather, let’s examine the first stanza of the poem, “It Couldn’t Be Done”, by Edgar Guest:  Somebody said that it couldn’t be done,      But he with a chuckle replied That “maybe it couldn’t,” but he[…]

Preamble. Since the failure of the Mount Polley TSF in British Columbia and Samarco in Brazil, many things have changed in the tailings management industry. New guidance documents and regulations have been promulgated, for example. More and more mining companies have engaged third party reviewers[…]

So let’s talk about tailings. This conversation is overdue.  In particular, let’s talk about hard-rock, milled tailings. There are other materials at other types of mining properties that are sometimes referred to as tailings. For example, at a diamond mine there is the ground waste product,[…]

If I could send a message back to a younger version of myself, I would have a lot to say to me. First, I’d tell myself to not take myself so seriously. Life is short. It is meant to be enjoyed. Literally take time to[…]

Most of the time, engineers calculate “factors of safety” for their designs. A factor of safety tells you how many times safer a design is than is really needed to serve its purpose. For example, an elevator may indicate a maximum load of 1000 pounds.[…]

My good friend, Jagrut Jathal has asked me the following questions: 1. Are upstream tailings dams really to blame for the recent incidents in Brazil? Despite the inherent risks, there are several such facilities across the world that have operated and continue to operate safely.[…]

This is just a very brief follow-up to the two previous parts of this blog. As I stated at the conclusion of Part 2, “In next week’s follow up to this blog, I’ll make it clear that not every emergency can come out this well,[…]

As I was saying, I began to develop a slope stability model.  What is a slope stability model, you may ask.  Well, it’s pretty much what it sounds like.  Some very clever people, starting many decades ago, began trying to solve a very complex issue of determining how[…]

A website provides a database of world-wide tailings dams failures from 1915 to present (https://worldminetailingsfailures.org/).  That website indicates that they support global research in tailings failure root cause, loss prevention and trend analysis.  Their database lists the following TSF failures that have resulted in more than 100[…]

On January 25, 2019, the Córrego do Feijão Dam 1 collapsed at the Vale iron ore mine near Brumadinho in Brazil, releasing 11 million metric tons of tailings into the areas below the facility, including mine infrastructure buildings. The collapse was essentially immediate and nearly[…]

WHEN A TAILINGS FACILITY FAILS When a tailings facility fails, lives are impacted; families are impacted. When a tailings facility fails, the environment suffers; communities can be devastated. When a tailings facility fails, the mining community as a whole suffers. When a tailings facility fails,[…]

In about 1996 or 1997, when I joined Toastmasters (which I highly recommend to anyone who needs to speak in public), my first speech to that group was titled, “I Tell People that I’m a Civil Engineer”.  The next line is… “But I’m not”.  It was a[…]

In April of 2015, I had the distinct pleasure of delivering a talk at the New York city’s chapter of the Society of Mining, Metallurgy and Exploration.  The occasion was their annual conference on Current Trends in Mining Finance.  My talk was a bit different[…]

Unlike most water dams, which are typically constructed in a single campaign, a tailings storage facility (TSF) is most often constructed in a number of campaigns, over the life of the mine (or the life of the TSF).  Why?  A water dam is constructed to[…]

The initial stage of mining starts with the process of finding and the exploration of the mineral deposit. Prospecting is a small-scale form of mineral exploration. Prospecting is physical work, involving traversing (traditionally on foot or on horseback), panning, sifting and outcrop investigation, and/or looking[…]

I opened the door into a brand new day. I drew the fresh air into my lungs as I gathered an armload of firewood and some kindling. Closing the door behind me, keeping the chill outside, I made my way to the fireplace. I placed[…]

I’m just returning from a trip to Australia, and I thought I’d share some of what I came across there, even though the content on this blog is largely non-technical, and it doesn’t even really follow the general themes of my previous blogs. The trip[…]