In this guest blog post by Eric Warinner, Chief UAV Pilot at Luck Companies, he discusses how UAVs (drones) have provided invaluable data and helped his company accurately assess inventory stockpiles across numerous sites in the US.
As one of the largest family-owned and operated aggregate producers in the US, Luck Stone has more than 25 different sites, stretching from South Carolina to Maryland. With such a vast area to cover, including quarries, rail yards and distribution yards, inventory management has historically been time-consuming and costly. By adopting unmanned aerial vehicles (UAVs), or drone technology as it is commonly known, Luck Stone has been able to successfully monitor stockpiles across its many sites and obtain more detailed and integrated insights to benefit the business.
A challenging terrain
Performing regular physical inventories of material stockpiles are crucial for Luck Stone, as the company relies on accurate results to shape both its accounting and future project planning. However, as the business has grown substantially since its launch in 1923, its geographical reach has also spread further, to now include quarries across several states. With an estimated 9,000 acres to cover on a quarterly basis, stockpile investigations can involve a lengthy process—with long lead times for data processing.
In addition to the vast amount of land that needs to be covered, the elements and activity at certain sites can be challenging when mapping. For instance, many of Luck Stone’s sites are active mining areas, with heavy machinery commonplace, increasing the safety risk significantly for surveyors carrying out ground investigations. Until recently, Luck Stone performed two inventories a year using a small manned aircraft, typically taking about a month each to complete. Although this technique proved safer than a traditional terrestrial approach, using a small airplane was a time-consuming and costly process. It was also challenging to find a suitable window in which to fly, as perfect weather across all sites was required for accuracy—a factor that was difficult due to the inclement conditions of the varied locations. As such, when Luck Stone was looking at innovative ways to map the terrain, ensuring reliability and surveyor safety was essential.
As an early adopter of UAV technology, Luck Stone partnered with data collection processing company, Airware, to explore potential drone solutions on the market that could optimise efficiencies across its mining sites. An aerial technique was determined to be the best approach to calculate accurate and reliable stockpile data, while also improving surveyor safety. Following recommendations from Airware, Luck Stone purchased a fully autonomous senseFly eBee RTK mapping drone. Additional features, such as its real-time kinematic (RTK) capability and virtual referencing stations (VRS) option, could also provide further data collection benefits to the team.
To map the stockpiles at each of Luck Stone’s sites, the team first carried out a pre-flight assessment using the eBee RTK’s eMotion 3 flight planning software, to check the feasibility and safety of the task and plan the route accordingly. Flying under the legal limit of 400 feet at 399 feet, across sites of up to 1,000 acres, the eBee RTK drone is then deployed between one and four times, depending on the size of the site and weather conditions. Each flight takes, on average, 30 to 40 minutes altogether. Following the flight, raw data is submitted to Airware’s processing software, through an online platform. Between 24 and 48 hours later, the team has access to detailed contour patterns and imagery, which is shared with each site for identification of stockpiles. The data can then be sent to the central financial department at Luck Stone, which confirms the stockpile amounts and forms an accurate inventory of all materials.
The benefits of using a UAV solution to map stockpiles has allowed Luck Stone to carry out more inventories than its previous method of using a manned aircraft. The speed and flexibility of the flight process, coupled with the fast turnaround of data, has enabled the team to perform quarterly inventories—a significant improvement on previous years, when it was limited to twice a year due to costs and time constraints.
For example, each individual site can now be assessed in a maximum of two and a half weeks, with the team having achieved this within one week to meet a particularly short deadline. The fast processing of data has also improved operational efficiencies, as it allows the team to continue flying the drone between different projects—relying on a continuous stream of data from Airware, instead of the previous two-week lead time to receive data. Despite the reduced administration burden following each flight, the number of employees required to carry out the process has not reduced, however, as one person is still needed on-site, with a further two supporting with data collection in the office.
“The depth of detail that we have been able to achieve using UAVs has really set our results apart from previous years. We have received a better resolution of data and benefited from greater flexibility and overall accuracy with a drone. For instance, using a manned aircraft could previously achieve a ground spatial distance of one-foot resolution, whereas now it is under six inches. We can now also have at least four data points per year, compared to the previous two using manned aircraft—helping us to streamline our processes in the long-term,” comments John Blackmore, Survey and Mapping Supervisor at Luck Stone.
“Using a UAV enables us to obtain up to 1,200 images per location—or more than 14,000 pictures for every company-wide inventory. Plus, in one year and three months, we have clocked around 400 hours’ worth of footage on the eBee RTK—a testament to the reliability of the solution. These insights have been integral to informing wider aspects of the business, beyond stockpiles, to allow us to respond quickly to market demands,” Blackmore adds.
In addition, Luck Stone has achieved significant cost savings as a result of adopting UAV technology in this sector. For example, using a manned aircraft across all 25 sites would cost around $50,000 to perform each inventory, with this taking place twice a year. With the integrated drone solution, stockpiles can now be measured four times a year at approximately the same cost, thanks to the flexibility and rapid deployment of the eBee RTK.
Using the senseFly eBee RTK drone as part of an integrated, end-to-end approach, Luck Stone has been able to collect highly accurate, professional aerial data for its sites quickly and easily, helping to save valuable time and resources over the course of the year. The quarterly results obtained from using UAVs have been instrumental, not only in sales planning but also in predicting future demands in the marketplace. Luck Stone’s leadership team were curious about and receptive to the idea of investing in UAV technology to improve efficiency. The company also has a mission that’s centered on the potential in people—so, empowering a team to explore the possibilities UAV technology holds was directly aligned with the company’s beliefs. The investment has also led to further requests for the use of drones in other departments at Luck Stone, such as during the inspection process or in thermal imaging.
In the future, the company is planning to invest in further eBee mapping drones for more frequent usage and is exploring the potential of regional versions with automated landing—helping to reduce the need for on-site operators and improving operational efficiencies across the company.
This article originally appeared in the August issue of Pit & Quarry.