In this paper, the authors described the seismic gap image before the 1668 Tancheng earthquake and the seismic gap image of modern East China, and found that they are very similar in that they are both around the Tanlu faulted zone, exhibit oval shape and have nearly NS-trending long axis. They occupy an area of about 39×10⁴km² covering Hebei, Henan, Shandong, Jiangsu, Anhui, Shanghai and the Yellow Sea. They are similar to each other in range, shape, area and formation time of the seismic empty region. In addition, since 2010, earthquake precursory anomaly has appeared in East China, which is located near the Tanlu faulted zone. The great earthquake risk probability along southern Tanlu zone is increasing, which is worthy of attention.

As an important strategic rare gas resource related to national security and the development of high-tech industries, helium is irreplaceable in liquid fuel rocket launch, deep diving and other fields, and has a profound impact on the high-quality development of "deep space, deep sea, deep earth, deep blue" and other fields. The integrated development of helium industry and innovation chains plays an important role to improve the security of resource supply. It has a great significance to promote the structural reform of helium supply and build a diversified helium supply system. This paper analyses the development situation of global helium resources industry and innovation chains integrated the resource side, the supply side, the consumption side, the trade side and the technology side. This study proposes the development status and challenges of China's helium industry and the corresponding development path of helium industry based on indicators such as resource conditions, capacity construction, foreign dependence, concentration of importing countries, concentration of importing enterprises, risk of importing countries, substitutability, the recycling rate, future supply and demand trend, industrial technology chain, management mechanisms. The results show that the global helium resource potential is considerable, but most countries remain in low exploration level; The global helium production capacity, supply, demand and trade pattern would be profoundly changing, but the contradiction between supply and demand would persist for a long time; The helium reservoir forming theory and exploration and development technology are underdeveloped, and the helium extraction equipment is continuously improved; The overall trend of global helium production develops well with a "helium heat" tide. The development subjects become diversified, which may change the global helium supply and demand pattern. China's helium development challenges and opportunities coexist considering the global helium resource industry chain pattern and the new trend of industry development. The 2022 is the key year to implement "the 14th Five Year Plan". It is desirable to conduct the work including the integrated chain analysis, the investigation and evaluation of helium resources, technical equipment research, the cultivation of market players, the construction of a diversified supply system. The above work will build an independent and controllable innovation chain, form a stable and resilient industrial chain, and provide helium resources guarantee for the development of high-tech industries.

Interactions among natural resources, socio−economic and ecological systems makes the resources, socio−economic and ecology as a coupled system. The coupled resources−socio−economic–ecological (REE) system were introduced for the cognitive connotation for ecological protection and restoration from the perspective of the coupled REE system. Based on the frontier research of coupled social−ecological system and the above cognitive connotation, we summarized three shortcomings of ecological restoration which were mainly reflected in the insufficient systemic nature of elemental association, insufficient spatial−scale integrated linkage and insufficient synergy with social sustainable development objectives. Therefore, we proposed the strategies for the transformation from coupling perspective in three aspects, including: ① strengthening systematic goals for pattern and pattern optimization, ② strengthening spatial linkage coordination among different scales, ③ enhancing matching with sustainable developing in high−quality synergy.

Mine ecological environment restoration is an important measure for the construction of ecological civilization, and hence it has attracted more and more attention and interest among geologists. In order to clarify the hot topics of the restoration of the eco-environment in China's mines in the past 20 years, the frontiers of the historical stage, and the current research progress so as to forecast future research directions, the authors used CNKI as the data source, and employed bibliometrics method and VOSviewer and CiteSpace visual analysis software to quantitatively analyze the relevant documents published in the period of 2000-2018. The results show that, in the past 20 years, the research achievements in the field of mine eco-environment restoration have mainly been published in the form of journals, and the number of documents issued has increased significantly year by year. The key words of "land reclamation", "eco-compensation and deposit", "phytoremediation of heavy metal pollution", "geological disaster management" and "green mine and mine park construction" are the hot research fields through the "co occurrence" analysis of the key words by VOSviewer. Using CiteSpace's unique time zone map analysis and highlighting key statistics functions, the authors found that China's mine eco-environment restoration has gone through three phases, and its connotation has been continuously enriched and developed. Multi-technical integration for carrying out mine land reclamation and geological disaster management, water and soil pollution source control and treatment technology research and application integration demonstration, ecological rehabilitation technology adapted to local conditions, and the construction of green mines and mine parks will be the research hotspots in the field of mine rehabilitation in the future.

Under the background of the vigorous development of big data, the quantitative prediction of mineral resources is the core part of geological big data. The basic idea of comprehensive analysis and mining of multi-information coincides with the concept of big data. With the Lala copper deposit as the study area, the authors carried out 3D mineral resources prediction based on machine learning. In this paper, 3D geological model was established to extract useful information of mineralization and build the quantitative prediction model of the study area. By using the "cube prediction model" prospecting method, the authors adopted the random forest algorithm of machine learning to calculate the probability distribution of mineralization in the study area. In this way, five prospecting prospective areas were delineated. The results show that the random forest has higher prediction accuracy and stability and can make quantitative evaluation on the importance of ore controlling factors. This study has successfully applied machine learning to the 3D mineral resources prediction and made a positive exploration for the prediction and evaluation of mineral resources in the future.

Mozambique, located in the southeast of Africa, is a vital country to strengthen the "One Belt And One Road" mining production capacity cooperation.Based on the study of the distribution of mineral resources and development status of important mines in Mozambique, the prospect of Chinese enterprises' mining investment in Mozambique is analyzed from the aspects of political stability and business environment.Mozambique's dominant oil and gas resources are mainly distributed in the Luvuma and Mozambique basins in the Sentoo-Rovuma-Zambezi-Maputo metallogenic belt, coal mainly in the Sentoo-Zambezi metallogenic belt, titanium-zirconium in the coastal area of the Sentoo-Rovuma-Zambezi-Maputo metallogenic belt, gold mainly in Niassa-Angónia- Zimbabwe metallogenic belt and Zimbabwe-Sentoo-Baruhe metallogenic belt, graphite in the Ancuabe and other areas of the Mozambique metallogenic belt, and tantalum and niobium in the Alto Ligonha area in the southern part of the Mozambique metallogenic belt.Mozambique is rich in mineral resources, especially oil, natural gas, coal, tantalum-niobium and heavy sand ore (titanium-zirconium) occupy an important position in the world.Although there are some unfavorable factors, such as backward infrastructure, lack of basic geological data and lengthy judicial procedures, it is believed that investors can start with heavy sand ore (titanium zirconium) and gold deposits with abundant resources and a good development basis; then targeting opportunities to invest in the development of petroleum, graphite, niobium tantalum and other minerals with greater potential; and at the same time, strengthen the international production capacity cooperation with local enterprises in Mozambique, promote local social and economic development, and jointly create a green and low-carbon development model.

Ghana is rich in mineral resources, and dominant mineral resources are gold, bauxite, manganese, diamond and so on.Ghana is one of the hotspot of exploration and development for international mining companies.In contrast, the working degree of geology and mineral resources in Ghana is generally low, lack of regional metallogenetic regularity summary and scientific evaluation of mineral resources potential, which restricts the choice and deployment of chinese companies in Ghana's mining investment.In this paper, on the basis of predecessors study, the regional geological background and the characteristics of dominant mineral resources in Ghana are clarified.And six Ⅳ-level metallogenic belts are divided, the geological and mineral characteristics of each metallogenic belt are summarized, and the mineral resources potential is evaluated.By collecting and sorting out various information and data, this paper summarized the current status of mineral exploration and development in Ghana, provided some specific suggestions on the mining investment in Ghana, and reference for overseas mining cooperation.

“Lithium Triangle”, a junction area among Argentina, Bolivia and Chile in South America, is a hot spot for lithium mining in this era of new energy industry revolution, hence it is necessary to discuss and compare the lithium resources distribution and mining investment environment of the area, so as to provide Chinese enterprises with suggestions for investing in the local lithiummining. The paper analyzes the metallogenic geological settings, resources distribution, exploration and development of lithium mining in the study area. It’s concluded that the vocalism since Miocene provided abundant metallogenic materials, and numerous closed catchment basins were formed in the process of Pliocene tectonic subsidence, coupled with the perennial evaporation in extremely arid climate of the Andean desert, then lithium resources were accumulated and conserved in the salt lakes. The superior-quality lithium resources, featured with high content of lithium ion and low ratio of Mg/Li in the brine water, are widely distributed in the junction of Argentina, Bolivia and Chile. Based on the specific conditions of the three countries in the Lithium Triangle, this paper adopted Analytic Hierarchy Process and Linear Weighted Comprehensive Evaluation to establish an evaluation index system of lithium mining environment. Four Tier I indexes including mineral resources endowment, policy and law, social environment and infrastructure, and 11 Tier II indexes including resource grade, Mg/Li ratio, resource quantity, exploration input, lithium mining foreign policy, fiscal and tax system, restrictions on profit repatriation, inflation rate, mining conflicts, infrastructure quality and water availability were generally analyzed. By calculation, the overall score of lithium mining environment in Argentina is 0.8, Chile 0.36 and Bolivia 0.27, indicating that Argentina is the best mining target in the region, and salt lakes such as Hombre Muerto, Cauchari-Olaroz deserve investment attention. The research conclusion may practically guide Chinese mining companies’ investment choice in Lithium Triangle.

Subduction of the Paleo-Pacific plate in Late Mesozoic resulted in intense volcanism and the formation of giant volcano-intrusive complex in the coastal area of southeastern China.Based on the rock association, time-space distribution, regional unconformity, tectonic background and mineralization type, the volcanic activities can be classified into four cycles.The first cycle (200~165 Ma) is represented by a set of nearly EW-trending bimodal volcanic rocks consisting of tholeiitic basalt and rhyolite.The basalt was mainly originated from asthenospheric mantle under the Indosinain post-tectonic plate extensional environment.During this period, the mineralization was weak.The second cycle (165~145 Ma) is the transition from peak compression to extension of epicontinental arc because of subduction, represented by the scattered calc-alkaline series andesitic dacite with association of low-temperature hydrothermal gold deposits and other non-metallic deposits, such as pyrophyllite.The third cycle (145~115 Ma) reflects extension stage of South China after subduction of paleo-Pacific plate, in which large areas of volcanic rocks consisting of high potassium calc-alkaline series rhyolite and dacite were formed in Mesozoic due to intensive volcanism.It was associated with abundant metallic, nonmetallic and rare earth minerals, dominated by hydrothermal type.In the fourth cycle(115~85 Ma), volcanism weakened and migrated toward east to the coastal area, dominated by the central eruption accompanied by A-type granite.It is a set of bimodal volcanic rocks with peralkaline rhyolite in the post-orogenic environment and developed porphyroclastic lava in the late period.In this stage, abundant metals and non-metallic minerals such as alunite and phyllite were formed, and the epithermal hydrothermal type was dominant, followed by porphyry type.