Recently, Yier Technology received a letter of gratitude from Longjiangting Copper Polymetallic Mine, WuPing Zijin Mining Co., Ltd. The letter highly praised the professional services provided by Deng Guangping, Yier Technology’s after-sales engineer dispatched to the site, and expressed sincere appreciation for the company’s outstanding technical capabilities and its commitment to continuous improvement in service quality.

Meanwhile, Wuping Zijin specially presented a banner bearing the words “Thoughtful service, excellent quality; precision craftsmanship, artisanal ingenuity,” thereby capturing the fruits of our collaboration and attesting to the mutual trust and recognition between us.

Fast-forward to March 2025, when Yier Technology’s AT-4000L Raise borer Machine was officially delivered to the Zijinshan Gold-Copper Mine in Fujian, marking the beginning of a deepened collaboration between the two parties. To date, this equipment has cumulatively completed 1,069 meters of raise bore construction, with an average pilot/bore-expanding efficiency of 1 meter per hour and a minimum deviation rate kept below 0.1%. With its robust performance, it has delivered an outstanding construction record. Behind these remarkable achievements lies not only the meticulous craftsmanship and intelligent manufacturing of the AT-4000L Raise borer Machine but also Yier Technology’s comprehensive, high-quality after-sales service support.

As a full-time after-sales engineer stationed on-site, Deng Guangping has earned unanimous recognition from both the upper and lower management at Wuping Zijin through his professionalism and unwavering dedication. On the technical front, thanks to his solid foundation and extensive practical experience, he confidently handles complex construction conditions and numerous uncertainties. In addressing the challenging construction task of "achieving a 4-meter-diameter borehole in one go," he worked closely with the mine’s team, drawing on the experience of "dynamic parameter adjustment" from the mineral processing field. After repeated trials and careful analysis, he developed a targeted solution featuring "low rotational speed combined with high-flow reverse sludge removal for hard-rock sections," successfully overcoming the technical bottleneck.

Faced with the challenging task of extracting the cutterhead from a shaft weighing as much as 15 tons, he personally supervised and guided every step—from calculating the stress on the gantry frame to precisely controlling the lifting angle—ensuring the cutterhead was safely and smoothly removed. During the high-precision construction that involved passing through the already-completed horse-head portal, he worked closely with the mining company to reduce the verticality tolerance of the drill rods to within 0.5 degrees, ultimately achieving an error margin of just 15 centimeters for the 125-meter shaft—a result far below the prescribed standard.

Throughout the service process, Deng Guangping has consistently demonstrated a warm and attentive attitude, responding promptly and efficiently to all requests. He communicates and coordinates with patience and meticulousness, and prioritizes safe operating procedures in his standardized work style, giving Wuping Zijin every reason to feel completely reassured.

In addition, he actively fulfills his training responsibilities by conducting specialized training sessions on the basic principles of equipment, operational techniques, daily maintenance, and troubleshooting—tailored to the characteristics of equipment usage across the three project phases. Through repeated hands-on practice, he ensures that all operators acquire the skills necessary to independently operate, maintain, and repair the equipment, thereby providing a solid human resource guarantee for its efficient and stable operation.

(Right one: Deng Guangping)

The successful completion of this collaboration not only highlights Deng Guangping’s professional competence but also underscores Yier Technology’s deep-rooted expertise in building its service system. The company rigorously implements its core service commitments, establishing a rapid emergency response mechanism that ensures a 2-hour response time, a 8-hour solution provision, and on-site arrival within 48 hours. During the warranty period, it provides free repair and parts replacement services, guaranteeing that spare parts will arrive on site within 48 hours. Additionally, the company offers free on-site guidance for unexpected engineering incidents, comprehensively alleviating customers’ concerns.

A letter of thanks and a banner of honor—both serve as high praise for Yier Technology’s past services and also express our earnest hopes for future collaboration. Moving forward, Yier Technology will continue to uphold the core values of innovation, professionalism, and service, constantly enhancing product performance and service quality. With more advanced technological solutions and more attentive on-site services, we will continue to provide robust support for an increasing number of mining projects, working hand in hand with our partners to achieve mutual success and write an even brighter chapter of development in the field of mining equipment!