Buyer Case Study: Cost Reduction With Thread Button Bits

In the world of mining and construction, every dollar counts. From fuel to labor, equipment to maintenance, operational costs can eat into profits faster than a drill bit chews through soft rock. For mid-sized operations like Greenfield Mining Corp., a copper mining company based in the Rocky Mountains, the challenge of balancing productivity with cost efficiency had become a daily battle—especially when it came to their rock drilling tools. That is, until they made a switch that would cut their annual drilling costs by 32%: swapping out their old taper button bits for high-performance thread button bits.

This isn't just a story about a new tool. It's about how a small change in equipment—paired with better compatibility with existing drill rods and a focus on durability—transformed Greenfield's operations, reduced downtime, and put serious money back into their budget. Let's dive into how they did it.

Greenfield Mining Corp. isn't a household name, but in the regional mining scene, they're a solid player. Founded in 2005, they operate two open-pit copper mines in Colorado, employing around 180 people and producing roughly 12,000 tons of ore per day. For years, their business model worked: extract ore, process it, sell to smelters, repeat. But by 2022, something was off.

"Our drilling costs were spiraling," says Maria Gonzalez, Greenfield's procurement manager, who's been with the company for a decade. "We were using taper button bits for most of our rock drilling—standard stuff, nothing fancy. But the more we dug, the harder the rock got. Our bits were wearing out faster, breaking more often, and every time we had to stop operations to ｒｅｐｌａｃｅ a bit, we were losing money."

Greenfield's mines are no walk in the park. The geology shifts from soft sedimentary rock in the upper layers to dense, abrasive granite and quartzite deeper down. Their fleet of drill rigs—mostly Atlas Copco and Sandvik models—ran 12-hour shifts, six days a week, boring blast holes up to 15 meters deep. With taper button bits, they were averaging just 45 meters of drilling per bit before replacement. For a mine that needed 2,000 meters of holes drilled weekly, that meant burning through 44 bits a week. At $145 per bit, that's $6,380 a week on bits alone—nearly $332,000 a year. And that didn't include the cost of downtime.

"Downtime was the silent killer," Maria explains. "Each bit change took about 20 minutes—times 44 bits a week, that's 14.7 hours of lost drilling time. Our drill operators are paid $35 an hour, so that's $514 a week in labor costs just for changing bits. Multiply that by 52 weeks, and we're talking $26,728 a year in wasted labor. Add in the lost ore production—we estimate each hour of downtime costs us about $2,200 in missed output—and suddenly, we're looking at over $170,000 a year in downtime-related losses. Total annual cost for our old setup? Over $528,000. And that was just for the bits and the time to ｒｅｐｌａｃｅ them."

To understand why Greenfield was struggling, let's break down the issues with their old taper button bits. Taper button bits are a common rock drilling tool, designed with a tapered shank that fits into the drill rod. They're affordable and easy to find, but they have a Achilles' heel: the taper connection. Over time, the repeated stress of drilling can loosen the taper, causing the bit to wobble or even detach mid-drill. When that happens, not only do you lose the bit—you risk damaging the drill rod, too.

"We had bits flying off the rods at least once a month," Maria recalls. "One time, a bit came loose and got stuck in a 12-meter hole. We had to send a crew down to fish it out, which took three hours. That day alone cost us over $6,600 in lost production. And the drill rod was bent beyond repair—another $450 down the drain."

Durability was another issue. The carbide buttons on Greenfield's taper bits were wearing down quickly in the hard granite. After just 40-50 meters of drilling, the buttons would become rounded, reducing penetration rate and forcing an early replacement. "It felt like we were changing bits just to keep up," says Juan Torres, head drill operator at Greenfield's North Mine. "By the end of a shift, my team was exhausted from the constant stops. We'd start a hole, drill 10 meters, the bit would go dull, swap it out, and repeat. It was demoralizing."

By early 2023, Greenfield's leadership team had had enough. They tasked Maria with finding a better rock drilling tool—one that could handle their tough geology, last longer, and reduce downtime. The goal? Cut annual drilling costs by at least 20% without sacrificing productivity.

Maria's first step was to hit the drawing board. She gathered her team—procurement specialists, drill operators, and maintenance technicians—and listed their must-haves for a new bit:

• Longer lifespan: At least 60 meters per bit (33% more than their current 45 meters).
• Stronger connection: A shank design that wouldn't loosen or detach, even in hard rock.
• Compatibility: Works with their existing drill rods (R32 and T38 thread sizes) to avoid costly equipment upgrades.
• Affordable: A price point that, even if higher per bit, would lower total cost when factoring in lifespan and downtime.

With these criteria, Maria started researching. She reached out to suppliers, attended a mining equipment trade show in Las Vegas, and even called at other mines to ask for recommendations. "I must have talked to a dozen suppliers," she says. "Some pushed PDC bits, but those are better for oil wells, not our hard rock. Others suggested surface-set diamond bits, but those are way too expensive for our scale."

Then, she met with a sales rep from a rock drilling tool wholesaler who specialized in thread button bits. "I'd heard of thread button bits before, but I'd always thought they were just for big oil companies," Maria admits. "But the rep explained that thread button bits have a threaded shank instead of a tapered one. The threads lock into the drill rod, creating a much tighter connection. No more wobbling, no more bits flying off. And the carbide buttons are usually larger and more wear-resistant, since the thread design allows for a sturdier bit body."

Intrigued, Maria asked for specs. The wholesaler's thread button bits were designed for hard rock applications, with 9 tungsten carbide buttons (11mm in diameter) and a matrix body for added durability. They were compatible with Greenfield's existing R32 and T38 drill rods, which was a huge plus—no need to ｒｅｐｌａｃｅ hundreds of drill rods. The price? $180 per bit—$35 more than their old taper button bits. But the rep claimed they could last 80-100 meters per bit in Greenfield's geology.

"I was skeptical," Maria laughs. "$180 a bit sounded steep, but if they really lasted twice as long, the math might work. Let's see: 45 meters per taper bit at $145 = $3.22 per meter. If thread button bits last 80 meters at $180 = $2.25 per meter. That's a 30% lower cost per meter. Plus, fewer changes mean less downtime. It was worth testing."

In March 2023, Greenfield ordered 50 thread button bits to test in their North Mine, which had the toughest rock. They started with a two-week trial: half the drill rigs would use the new thread button bits, and the other half would stick with the old taper button bits. The goal? Compare performance, lifespan, and downtime side by side.

Juan Torres, the head drill operator, was put in charge of the trial. "I was nervous at first," he says. "Change is hard, especially when you're used to a tool. But the thread button bits were easy to install—just screw them into the drill rod, no hammering like with taper bits. That alone saved a minute or two per change."

The results of the trial shocked everyone. "After two weeks, the numbers spoke for themselves," Maria says. "The thread button bits averaged 89 meters per bit—nearly double the lifespan of the taper bits. And we didn't have a single bit detach or break. The drill operators reported smoother drilling, too—less vibration, which made the equipment easier to handle. It was like night and day."

Encouraged, Greenfield expanded the trial to all their drill rigs for another month. By the end of April, they had enough data to make a decision. "We were averaging 85 meters per thread button bit across both mines," Maria explains. "Even in the softer rock at our South Mine, they lasted 78 meters—still way better than the taper bits' 45 meters. And downtime? We went from changing 44 bits a week to just 23. That's 21 fewer changes, cutting downtime to 7.7 hours a week. Labor costs for bit changes dropped to $269 a week, and lost production from downtime fell to $88,000 a year. It was a no-brainer."

In May 2023, Greenfield made the full switch to thread button bits. By the end of the year, they'd tracked their costs for six months and compared them to the previous year's data. The results were staggering. Let's break it down in black and white:

"A 32% cost reduction—over $210,000 a year—was beyond our wildest expectations," Maria says, still impressed. "We'd aimed for 20%, but the thread button bits outperformed even the supplier's promises. And the savings keep adding up. We haven't had to ｒｅｐｌａｃｅ a single drill rod due to bit damage since the switch—before, we were replacing 10-12 drill rods a year at $450 each, so that's another $5,400 in annual savings. Plus, the operators love them. Less vibration means fewer hand and arm injuries, and the smoother drilling has boosted morale. It's a win-win."

Juan Torres agrees. "I've been drilling for 15 years, and these are the best bits I've ever used," he says. "Last month, we had a thread button bit that drilled 97 meters in the North Mine's granite—almost twice what we used to get. I called Maria to tell her, and she thought I was joking. But it's true. These bits just don't quit."

While the cost savings were the headline, Greenfield also noticed a few unexpected perks from switching to thread button bits. For one, the better connection with drill rods reduced wear and tear on their drill rigs' hydraulic systems. "The old taper bits caused a lot of vibration, which put stress on the rig's pumps and hoses," explains Carlos Mendez, Greenfield's maintenance manager. "Since switching to thread button bits, we've seen a 20% ｄｒｏｐ in hydraulic system repairs. That's another $15,000 a year in maintenance savings."

Another surprise? The thread button bits produced more consistent blast holes. "With the taper bits, the wobbling sometimes made the holes slightly off-center," Maria says. "That led to uneven blasting, which meant more ore was left unbroken or over-broken (too fine to process). With the thread button bits, the holes are straighter, so our blasts are more efficient. We're recovering about 5% more ore per blast, which adds up to an extra 600 tons of ore per day—worth over $3,000 a day in additional revenue. That's over $900,000 a year in extra profit, just from better blasting."

And then there's sustainability. "We're throwing away half as many bits now," Maria notes. "Less waste means we're reducing our environmental footprint, which is something our investors care about. It's not just about cost—it's about being a responsible operator."

Greenfield Mining Corp.'s story isn't unique. Many mid-sized mining and construction companies stick with familiar tools out of habit, even when those tools are costing them money. But by taking the time to research alternatives—in this case, thread button bits—they unlocked significant savings, improved productivity, and even boosted morale.

"The key takeaway for me is that cost per unit isn't everything," Maria says. "Our old taper button bits were cheaper upfront, but they cost us way more in the long run. Thread button bits are an investment, but the return is immediate—lower per-meter costs, less downtime, fewer headaches. If you're in rock drilling, don't sleep on thread button bits. They might just be the tool that saves your budget."

As for Greenfield? They're now looking into other rock drilling tool upgrades, like higher-performance drill rods and carbide cutting tools for their secondary crushers. "Once you start seeing the value in better tools, you don't want to stop," Maria laughs. "Who knows? Maybe next year, we'll be writing another case study about how we cut costs even further. But for now, we're celebrating the $210,000 we're putting back into our business—thanks to a simple switch to thread button bits."