The “Ballast Stone” for Strengthening Phosphate Ore Resource Reserves — A Brief Account of How the China Chemical Geology And Mining Bureau Serves and Safeguards National Mineral Resource Security

Phosphate rock is a strategic non-metallic mineral resource. Phosphate chemicals are vital to the security and stability of critical industrial and supply chains, including food security, public health, new energy, and new-energy vehicles. The China Chemical Geology And Mining Bureau (hereinafter referred to as “China Coal Bureau’s Chemical Bureau”) has always regarded serving the nation’s major strategies as its mission, proactively shouldering the responsibility of geological exploration for mineral resources. Focusing on the challenges and key areas in the exploration and development of phosphate resources, it has continuously advanced through theoretical innovation, technological breakthroughs, and practical problem-solving, making sustained efforts in studying the ore-forming laws of phosphate deposits, exploring deep‑lying resources, and promoting comprehensive resource utilization, thereby laying a solid foundation with its professional expertise to ensure national energy and resource security and support high‑quality industrial development.

The Phosphate Ore Reconnaissance Project Team at the Tuanbao Mining Area in Baokang County, Hubei Province, is currently conducting field borehole logging.

Establishing a New System for Phosphate Ore Formation

In the field of geological research, developing a new understanding of phosphate‑ore genesis represents an exploration of profound significance. In recent years, driven by the deepening integration of multidisciplinary approaches and advances in exploration technologies, researchers have steadily refined their knowledge of the genetic mechanisms governing phosphate‑ore formation.

The research teams of the China National Coal Administration and the China National Chemical Industry Administration have conducted in-depth studies on phosphate deposits in the Hubei, Hunan, Sichuan, Guizhou, and Yunnan regions, systematically investigating the formation mechanisms and enrichment patterns of these deposits. They have identified underwater uplifts within shallow marine bays as optimal sites for phosphate precipitation and accumulation, and innovatively proposed a “bay‑scale colloidal chemical deposition–breakup–re‑deposition” model of phosphate mineralization, thereby providing a new theoretical framework for understanding the regional distribution of phosphate resources. Building on this work, they have delineated a Class III phosphate metallogenic belt in China, defined key ore‑forming factors, and developed predictive models. They have also put forward recommendations for prioritizing exploration targets and guiding deep‑level resource exploration in the major phosphate‑rich areas of Hubei, Hunan, Sichuan, Guizhou, and Yunnan, thus enhancing the scientific rigor and effectiveness of regional phosphate prospecting.

The Xinchang Phosphate Mine project team is currently conducting drilling operations.

Theoretical guidance informs phosphorus research and practice.

Under the scientific guidance of innovative ore‑formation theories and prospecting models, the bureau has achieved a series of remarkable successes in mineral exploration, with major breakthroughs vividly demonstrating the powerful driving force of theory on practice. In deep‑level exploration, relying on precisely delineated prospective phosphate‑ore districts, they have identified 225 phosphate‑ore occurrences. In recent years, the bureau has conducted systematic studies in Guizhou Province, China. By comprehensively analyzing paleogeographic data and the distribution patterns of phosphorus‑bearing strata, they have accurately targeted exploration areas and, based on ore‑forming principles, scientifically predicted favorable concealed‑ore zones. As a result, they have successfully discovered one large, high‑grade phosphate deposit, with Class I phosphate rock reserves exceeding 100 million tonnes—making it not only one of the largest single deposits of high‑grade phosphate in China over the past five years but also a significant milestone in domestic exploration for ultra‑deep, concealed, high‑grade phosphate deposits during the same period. Applying sedimentary phosphate‑deposit formation theory and integrating regional stratigraphic and tectonic characteristics, the bureau has conducted a comprehensive assessment of deep‑seated phosphate resources in western Hubei, delineating a phosphate‑enrichment zone and mapping the extent of the principal industrial phosphate layers. Sparse drilling verification indicates that the inferred resource estimate for phosphate rock in this area exceeds the super‑large category; notably, the newly discovered concealed, extra‑large phosphate deposit represents the most significant breakthrough in Yichang’s deep‑level exploration during the 14th Five‑Year Plan period, further bolstering the region’s phosphate resource base and laying a crucial foundation for subsequent development and utilization.

The Yongwen Daping Phosphate Mine Project Team is currently examining the core samples.

Breaking Through Technical Bottlenecks in Phosphate Ore Exploration

Southwest China is a region characterized by the dense distribution of karst landforms, where surface topography and subsurface geological structures are exceptionally complex. During drilling, drill bits are prone to borehole wall collapse and mud loss, placing extremely high demands on drilling‑operation expertise. Research teams have found that many projects have encountered “stuck‑pipe” incidents—where the drill bit becomes immobilized underground—resulting in prolonged troubleshooting, frequent borehole abandonment, and substantial economic losses that are difficult to quantify. In response to these challenges in deep‑well drilling, the bureau has pursued innovations in drilling processes and techniques, developing a “deep‑well submersible pump that prevents oscillation.” This technology effectively addresses the common issues of traditional submersible pumps—namely, excessive vibration and swaying during operation, as well as the risk of damage caused by contact between the pump’s outer casing and the wellbore wall—thereby significantly enhancing the productivity of deep‑phosphate‑mineral exploration. The achievement has been evaluated by the China Nonmetallic Minerals Industry Association as a scientific and technological breakthrough, reaching a domestically leading level.

Currently, Guizhou’s mineral exploration is advancing from the “first prospecting domain” at depths shallower than 1,000 meters to the deeper “second prospecting domain.” In this region, phosphate ore bodies are often deeply buried, posing significant challenges such as inadequate rock‑mass stability, complex ground‑pressure management, and pronounced tectonic interference. To achieve major breakthroughs in deep‑level mineral exploration, continuous innovation in geological science and technology across the entire exploration process is essential. Leveraging innovations in phosphate‑ore exploration and hidden‑deposit discovery, the China National Coal Administration and the China National Chemical Corporation have employed high‑precision geophysical surveys to finely resolve subsurface lithological structures, complemented by three‑dimensional geological modeling to accurately delineate orebody distribution. This approach has, for the first time, enabled a breakthrough in exploration at depths of around 1,800 meters. The integrated application of these technological and managerial innovations has yielded remarkable efficiency gains: the entire exploration campaign was completed in just a few months—setting a new record for speed among similar projects; average borehole depths reached 1,500 meters, breaking previous records for ore‑layer depth; and water‑pumping tests in the phosphate ore zone achieved drawdown levels exceeding 800 meters, surpassing the deepest comparable tests to date. Moreover, field‑acceptance‑grade exploration reports all received top ratings, establishing a benchmark for quality. These achievements have substantially shortened project timelines and reduced costs, demonstrating that integrated technologies can multiply exploration efficiency and providing a replicable practical model for the efficient exploration of deep‑seated mineral resources.

Expanding the boundaries of phosphate rock resource utilization

China’s phosphate rock resources are relatively poor in quality, with medium- and low-grade ores predominating; the average grade is 5 percentage points lower than the global average. Moreover, these phosphate ores often contain significant amounts of associated minerals such as fluorine, iodine, and rare earth elements.

In recent years, the research teams of the China National Coal Administration and the China National Chemical Industry Administration have undertaken numerous national key science and technology projects, National Natural Science Foundation initiatives, and administration‑level scientific programs. They have achieved significant breakthroughs in the comprehensive utilization of low‑ and medium‑grade phosphate ores and associated mineral resources, making substantial contributions to enhancing resource security, strengthening risk‑response capabilities, and safeguarding energy and resource stability. Notably, the administrations jointly spearheaded the development of the group standard “Identification of Low‑Grade Phosphate Ores,” which further clarifies the criteria for defining and evaluating such ores, providing a unified technical framework for their efficient exploitation and utilization, and thereby supporting the industry’s more systematic advancement of resource‑integrated utilization. In addition, the administrations have, for the first time, established a quantitative estimation model for fluorine resources associated with sedimentary phosphate deposits in China. Based on ore‑deposit data from major sedimentary phosphate mining districts in the Yangtze region, they have estimated the quantity of these associated fluorine resources. This achievement will help phosphate‑chemical enterprises accurately assess their reserves of fluorine resources co‑occurring with phosphate ores, thus elevating the level of efficient and integrated resource utilization.

The China Chemical Geology And Mining Bureau, from establishing a theoretical framework for ore formation and overcoming technological barriers in deep‑level exploration to achieving efficient resource development and comprehensive utilization, has not only strengthened the “ballast stone” of the nation’s phosphate resource reserves but also driven a transformation in the industry’s development model through technological upgrades. By translating research outcomes into practical applications, it has served local economies and facilitated industrial upgrading, thereby making a solid contribution to safeguarding national strategic mineral resource security and promoting the high‑quality development of the phosphate chemical industry.