Quantitative analysis of geological ore-controlling factors and stereoscopic quantitative prediction of concealed ore bodies

To address the issues for assessing and prospecting the replaceable resource of crisis mines, a geological ore-controlling field model and a mineralization distribution field model were proposed from the viewpoint of field analysis. By dint of solving the field models through transferring the continuous models into the discrete ones, the relationship between the geological ore-controlling effect field and the mineralization distribution field was analyzed, and the quantitative and located parameters were extracted for describing the geological factors controlling mineralization enrichment. The method was applied to the 3-dimensional localization and quantitative prediction for concealed ore bodies in the depths and margins of the Daehang mine in Guangxi, China, and the 3-dimensional distribution models of mineralization indexes and ore-controlling factors such as magmatic rocks, strata, faults, lithology and folds were built. With the methods of statistical analysis and the non-linear programming, the quantitative index set of the geological ore-controlling factors was obtained. In addition, the stereoscopic located and quantitative prediction models were set up by exploring the relationship between the mineralization indexes and the geological ore-controlling factors. So far, some concealed ore bodies with the resource volume of a medium-sized mineral deposit are found in the deep parts of the Dachang Mine by means of the deep prospecting drills following the prediction results, from which the effectiveness of the predication models and results is proved.

Geochemical Trace of Silicon Isotopes of Intrusions and Ore Veins Related to Alkali-rich Porphyry Deposits in Western Yunnan, China

Western Yunnan is the well-known polymetallic province in China. It is characterized by copper-gold mineralization related to Cenozoic alkali-rich porphyry. This paper analyzes the silicon isotope data obtained from four typical alkali-rich porphyry deposits based on the dynamic fractionation principle of silicon isotope. The study shows that the ore materials should originate mainly from alkali-rich magmas, together with silicon-rich mineralizing fluids. The process of mineralization was completed by auto-metasomatism, i.e. silicon-rich mineralizing fluids (including alkali-rich porphyry and wall-rock strata) replaced and altered the country rocks and contaminated with crustal rocks during the crystallization of alkali-rich magmas. Such a process is essentially the continuance of the metasomatism of mantle fluids in crust's mineralization. This provides important evidence of silicon isotopic geochemistry for better understanding the mineralization of the Cenozoic alkali-rich porphyry polymetallic deposits

Geochemical Characteristics,Genesis of Concealed Cu-rich Ore Body in the Jinchuan Deposit,Northwestern China,and Its Prospecting

The Jinchuan deposit is hosted by the olivine-rich ultramafic rock body, which is the thirdlargest magmatic sulfide Ni-Cu deposit in the world currently being exploited. Seeking new relaying resources in the deep and the border of the deposit becomes more and more important. The ore body, ore and geochemistry characteristics of the concealed Cu-rich ore body are researched. Through spatial analysis and comparison with the neighboring II1 main ore body, the mineralization rule of the concealed Cu-rich ore body is summed up. It is also implied that Cu-rich magma may exist between Nirich magma and ore pulp during liquation differentiation in deep-stage chambers, which derives from deep-mantle Hi-MgO basalt magma. It is concluded that the type of ore body has features of both magmatic liquation and late reconstruction action. It has experienced three stages： deep liquation and pulsatory injection of the Cu- and PPGE-rich magma, concentration of tectonic activation, and the later magma hydrothermal superimposition. In addition, the Pb and S isotopes indicate the magma of I6 concealed Cu-rich ore body originates predominantly from mantle; however, it is interfused by minute crust material. Finally, it is inferred that the genesis of the Cu-Ni sulfide deposit is complex and diverse, and the prospect of seeking new deep ore bodies within similar deposits is promising, especially Cu-rich ore bodies.

Approaches to location prognosis of concealed ore deposits (bodies) of productive mines

This paper demonstrates the channels and methods for location prognosis of concealed ore deposits (bodies) in the deep seated and surrounding districts of productive mines in accordance with their special features. The system frame map is built, from quick exploration in the field to the rapid building of a model indoors. The main research points of location prognosis are also discussed in the paper, which include: 1) integrating the location with the surrounding geological areas, microscopic with macroscopic; 2) analyzing and synthesizing all geological information of different levels, depths and aspects; 3) laying stress on mineralization series; 4) paying attention to the study of the distribution law of ore bodies; 5) introducing the theory of nonlinear dynamics of ore forming processes to ordinary static prognosis; 6) the necessity of the geophysical me thod in recovering information of concealed ore bodies; 7) the combination of all kinds of geology, geophysics, geochemistry and remote sensing methods.

Location Prediction of Blind Ore bodies in Shuijingtun Gold Mine, Zhangjiakou, China

By analyzing the metallogenic conditions and prospecting marks of F 8 fault belt in Shiujingtun Gold Mine, the geochemical samples were collected along F 8 fault belt and prospecting profile normal to the F 8 fault belt. Gold and its indicator elements were tested with X ray fluorescence spectrometry and the content distribution diagram of Au, Ag, Hg and As along the F 8 fault belt was performed. The geochemical primary halo model and the Grey system model of F 8 fault belt are established. With these element distribution features and models, the blind ore bodies in the F 8 fault belt were predicted. Engineering prospect shows that the industrial orebodies have been discovered and the prediction results are dependable.

Occurrence of Manganese Ore Deposits and Their Mineralogy in Vizianagaram-Visakhapatnam Manganese Ores Belt (Andhra Pradesh) India

The Manganese deposits of Andhra Pradesh are associated with a thick sequence of Precambrian rocks, belonging to Khondalite and Charnockite groups of Dharwar Supergroup that forms part of 2500 to 3000 m.y. old Eastern Ghat complex of India. The study area is the Manganese deposits of Vizianagram-Visakhapatnam Manganese Belt of Andhra Pradesh. The study area lies about 150 km NE of Visakhapatnam between 18°12′N - 18°30′N and 83°20′E - 83°45′E. The mineralization of Manganese ores is confined to different rock types, belonging to both Khondalite and Charnockite groups, where they are dispersed throughout the country rocks as small lenses, pockets, veins and irregular bodies of varying dimensions. Quartz, garnet, clay, limonite and apatite are the common gangue minerals in the Manganese ores. The presence of quartz, garnet and apatite brings down the grade of the ore. Ferruginous laterite and ochre generally work as capping of the Manganese deposits. The various Manganese ore minerals present in these deposits are indentified as 1) Primary minerals-braunite, bixbyite, vredenburgite, jacobsite and hausmannite, 2) secondary minerals-psilomelane, cryptomelane, hollandite, pyrolusite and wad. The primary ore minerals are considered to be syngenetic and regionally metamorphosed while, the associated secondary ore minerals are formed due to alteration of the primary ores.

Ore-forming fluid characteristics and genesis of vein-type lead-zinc mineralization of Xiaohongshilazi deposit,Jilin Province, China

The Xiaohongshilazi mineral deposit in Jilin Province,China,is located in the accretion zone in the northern margin of the North China Block. The deposit contains two types of ore bodies: layered Pb-Zn ore bodies in volcanic rock and vein-hosted Pb-Zn ore bodies controlled by fractures. The vein Pb-Zn ore bodies are strictly controlled by tectonic fracture zones trending in S-N direction,which comprise sulfide veins or sulfidebearing quartz veins distributed along faults or structural fissures. The ores mainly appear mesh-vein and vein structures,and also show solid-solution separation and metasomatic textures. The metal minerals are mainly sphalerite,galena,and pyrite,etc. Wall-rock alteration includes mainly sericitization,chloritization,silicification and carbonatization,etc. Microscope observations and Raman spectroscopy analyses indicate that the oreforming fluid of the vein Pb-Zn ore bodies was mainly magmatic water with low temperature,low salinity,and a shallow depth of metallogenesis( ~ 1.5 km). Sulfur and lead isotope analyses indicate that the sulfide source is mainly formation sulfur or biogenic sulfur,which is similar to the sulfur source of hydrothermal deposit( negative( δ^(34) S values),while the main Pb source was the upper crust with some mantle input. This article argues that the vein Pb-Zn ore body of the Xiaohongshilazi deposit is a low-to medium-temperature hydrothermal vein type related to the formation of a shallow magma chamber.

Ground subsidence mechanism of a filling mine with a steeply inclined ore body

Long-term field monitoring finds that serious surface subsidence can still occur even if the high strength cemented fill method is adopted.Combining the results of numerical simulations with global position system(GPS)monitoring,we took a typical filling mining mine with a steeply inclined ore body as an example,and explored its ground subsidence mechanism.The results show that the ground subsidence caused by the mining of steep ore body is characterized by two settlement centers and a significantly uneven spatial distribution,which is visibly different from ground subsidence characteristic of the coal mine.The subsidence on the hanging wall is much larger than that on the footwall,and the settlement center tends to move to the hanging wall with the increase of mining depth.The backfill improves the strength and surrounding rock bearing capacity,which leads to a lag of about 3 years of the subsidence.However,under the actions of continuous and repeated mining disturbances,the supporting effect of the backfill can only reduce the amplitude of the deformation,but it cannot prevent the occurrence of settlement.

Removal of a pulmonary artery foreign body during pulse ablation in a patient with atrial fibrillation:A case report

BACKGROUND Foreign bodies in the pulmonary circulation have been documented in the literature and are typically caused by interventional procedures.However,reports of pulmonary artery foreign bodies during femoral vein puncture are rare,and there is no description of this complication from the guidewire surface flows into the pulmonary artery during a pulse ablation in a patient with atrial fibrillation.CASE SUMMARY We described a case in which a linear foreign body suddenly appeared on fluoroscopy image during pulsed ablation of atrial fibrillation.Multiposition angiography showed that the foreign body was currently lodged in the pulmonary artery but was hemodynamically stable.We then chose to use an interventional approach to remove the foreign body from the pulmonary artery.This foreign body was subsequently confirmed to be from the hydrophilic coating of the guidewire surface.This may be related to the difficulties encountered during the puncture of the femoral vein.This is a rare and serious complication of femoral vein puncture.Therefore,we reported this case in order to avoid a similar situation.CONCLUSION Mismatches between interventional devices from different manufacturers used for femoral venipuncture may result in pulmonary artery foreign bodies.

富水软弱围岩劈裂型注浆加固体力学性能与破坏模式

富水软弱围岩劈裂型注浆加固体的力学性能与破坏模式对注浆整体效果具有显著影响。基于室内注浆模拟试验、劈裂型注浆加固体三轴压缩试验和相应的离散元数值模拟,研究劈裂浆脉形态与空间分布特征及注浆加固规律,分析浆脉粗糙度、厚度、数量和倾角对注浆加固体力学性能与破坏模式的影响,阐明三轴加载条件下加固体内部孔隙率和微裂纹演化规律。研究结果表明:劈裂浆脉空间分布模式主要包括半贯通型、交叉型和贯通型,注浆影响区域可分为加固区、过渡区和未扰动区;浆脉存在有效提升了加固体的整体刚度和承载力,加固体峰值偏应力与浆脉粗糙度、厚度、数量呈正相关关系,而浆脉倾角增大会导致整体强度降低;加固体破坏模式主要有局部膨胀型和剪切滑移型,受浆脉形态特征影响,二者对整体变形破坏的贡献程度不同;在加载过程中,浆-土界面处首先萌生微裂纹,进而浆脉两侧软弱介质被压缩挤密后出现大量微裂纹,裂纹数量持续增多直至试样破坏;加固体孔隙率与微裂纹萌生数量变化规律均呈现明显的阶段性特征,且受浆脉形态特征影响显著。

热液脉型萤石矿床隐伏矿体定位预测综合技术方法

萤石是国家战略性新兴产业发展中不可或缺的关键支撑原材料,被国际社会普遍列为“关键矿产”,随着萤石露头矿的发现殆尽,急需开展隐伏矿体的深部定位预测研究。文章简要论述了断裂构造控制的热液脉型萤石矿床地质特征、分带模式和成矿规律,评述了萤石找矿中常用的勘查技术方法。结合找矿标志和控矿要素分析,总结了隐伏-半隐伏萤石矿体定位预测的找矿模型,提出了“分带型”和“掩埋型”两种类型隐伏萤石矿体及相应的找矿技术方法组合。笔者建立了隐伏萤石矿体定位预测的地质-物探-化探-遥感综合找矿模型及其四步勘查技术流程,这对指导隐伏萤石矿床(体)的找矿勘查具有重要的理论和实践意义。

急倾斜极薄矿脉小型机械化留矿法开采采场稳定性分析

基于珊瑚钨矿急倾斜极薄矿脉小型机械化留矿法开采工艺,采用数值模拟方法分析了开采过程中采场的稳定性,探讨了采场长度、相邻采场开采时应控制的安全距离和回采顺序。结果表明:1)矿体采出后,采场上下盘围岩发生以水平向位移为主的相向位移,采空区上下两端与顶底板接触位置发生应力集中,采空区两侧围岩应力降低;2)采场长度对采场稳定性的影响较小,为提高单条采场生产能力,采场长度可由试验阶段的100 m增加到150~200 m;3)为减小相邻采场开采扰动,相邻采场开采时的安全距离应控制在4 m以上,局部地段围岩条件较差时还应适当加大;4)对于上下相邻采场,待采矿体位于已采采场的下盘围岩移动范围更有利于采场稳定性控制,建议采用从上向下的回采顺序。研究结果可为采矿工程实践提供一定的参数参考。

下肢静脉曲张术后延续性干预的效果及复发影响因素分析

目的探讨下肢静脉曲张术后延续性干预的效果及复发影响因素。方法选择2020年3月至2022年9月收治的下肢静脉曲张并行手术治疗的患者100例,随机分为观察组和对照组各50例,对照组行常规干预,观察组使用延续性干预,对比2组复发情况、凝血功能及生活质量。根据患者术后12个月是否复发分为复发组42例和未复发组58例,收集2组一般资料,应用多因素Logistic回归分析术后复发的影响因素。结果观察组术后6、9、12个月复发率低于对照组(P<0.05,P<0.01);观察组凝血酶时间、凝血酶原时间及活化部分凝血酶原时间均长于对照组(P<0.05);观察组躯体、心理、角色、社会四个维度评分均高于对照组(P<0.05)。年龄≥60岁、体质量指数、文化程度、静脉曲张年限、凝血功能以及延续性干预均是下肢静脉曲张术后复发的影响因素(P<0.05,P<0.01)。结论年龄、体质量指数、文化程度、静脉曲张年限及凝血功能是下肢静脉曲张术后复发影响因素,术后应用延续性干预能降低复发率,提高患者生活质量。

下腔静脉滤器脱落移位至右髂外静脉1例

患者男,87岁,左下肢肿胀、疼痛1月余,加重并红肿4天;患慢性阻塞性肺疾病多年,具体不详。查体:左大腿内侧至小腿上段肿胀,皮肤潮红、皮温升高,波动感(+)。下肢静脉超声见左侧腘静脉至胫后静脉局部血栓形成。于左小腿抽出暗红色脓液,细菌涂片显示革兰氏阳性球菌(++)。

带电多囊体蛋白5在调控血管内皮细胞焦亡中的作用研究

目的:探究带电多囊体蛋白5(charged multivesicular body protein 5,CHMP5)在人脐静脉内皮细胞(hu-man umbilical vein endothelial cell,HUVEC)焦亡中的表达以及敲低CHMP5对HUVEC焦亡的影响。方法:采用聚肌胞苷酸(polyinosinic-polycytidylic acid,Poly I:C)刺激HUVEC建立病毒性脓毒症中双链RNA(double-stranded RNA,dsRNA)诱导血管内皮细胞损伤的体外模型。将HUVEC随机分为对照组、Lipo组、Poly I:C组、siNC组和siCHMP5+Poly I:C组,通过实时荧光定量PCR(real-time fluorescent quantitative PCR,qRT-PCR)检测各组CHMP5的表达。采用乳酸脱氢酶(lactate dehydrogenase,LDH)细胞毒性检测试剂盒检测LDH释放率、ELISA检测白介素-1β(interleukin-1β,IL-1β)分泌及透射电子显微镜(transmission electron microscopy,TEM)检测HUVEC的超微结构以观察细胞膜的完整性,蛋白质印迹(Western blotting)检测相关蛋白胱天蛋白酶-3活性剪切体(cleaved caspase-3,活化Casp-3)、gas-dermin E蛋白N端(gasdermin E N-terminal,GSDME-N)的表达水平,免疫荧光染色检测各组细胞相关蛋白的表达和定位。结果:与对照组相比,Poly I:C组HUVEC细胞肿胀,多处细胞膜破裂,同时活化Casp-3、GSDME-N和CHMP5蛋白表达上调(P<0.05)。RNAi技术敲低CHMP5后,与对照组和siNC组比较,siCHMP5+Poly I:C组LDH和IL-1β释放增加,焦亡相关蛋白表达水平上调以及GSDME蛋白募集分布改变,内皮细胞焦亡明显加重(均P<0.05)。结论:CHMP5在HUVEC细胞焦亡中呈现高表达。敲低CHMP5可增强HUVEC细胞焦亡,可能与抑制膜修复促进GSDME和GSDMD蛋白剪切引起的继发性细胞焦亡有关。

开颅手术后深静脉血栓形成的危险因素

目的探讨开颅手术后深静脉血栓(DVT)形成的危险因素。方法回顾性收集2019年1月~2022年12月在江苏省人民医院神经外科接受开颅手术治疗的患者202例的数据资料。根据患者术后是否发生DVT进行分组,未发生DVT的为对照组(n=160),发生DVT的为观察组(n=42)。描述全部患者的临床资料情况,分析开颅手术后深静脉血栓形成的独立影响因素,采用logistic回归模型进行开颅术后深静脉血栓形成的预测效果分析。结果202例患者中42例患者发生DVT,DVT发生率为20.79%。单因素分析结果中显示,两组患者的失血量、术后绝对卧床时间长度、凝血因子功能亢进比例数据差异具有统计学意义(P<0.05)。多因素分析结果显示,凝血因子功能亢进、失血量较大、术后绝对卧床时间长度较长是开颅手术后发生DVT的独立危险因素(P<0.05)。利用多因素模型以及各独立影响因素对开颅手术后发生DVT进行预测,最佳截断值分别为526.42 ml、9.78 d、0.50、27.15%,ROC曲线下面积分别为0.763、0.859、0.730、0.948,约登指数分别为62.41%、57.95%、46.04%、82.47%。结论开颅手术患者在术后发生DVT的风险较高,通过危险因素的分析仪预测模型的建立,可以更好对该种情况进行防控,有助于降低患者的风险,提升手术成功率。

PE孕妇分娩时体质指数联合血浆FIB水平评估产后深静脉血栓栓塞症价值

目的:探讨子痫前期(PE)孕妇分娩时体质指数(BMI)联合血浆纤维蛋白原(FIB)水平对产后深静脉血栓栓塞症(DVT)的评估价值。方法:回顾性收集本院2021年3月-2022年9月收治的PE孕妇70例临床资料,根据产后是否发生DVT分为DVT组(16例)和非DVT组(54例)。比较两组临床特征,分析影响PE孕妇产后发生DVT的危险因素,分娩时BMI联合血浆FIB水平预测PE孕妇产后发生DVT价值。结果:DVT组妊娠期血栓史、产褥期卧床时间≥72h、分娩时BMI≥30kg/m^(2)占比均大于非DVT组,产前血浆FIB水平(5.3±0.7 g/L)高于非DVT组(4.6±0.6 g/L)(均P<0.05)。有血栓史、产褥期卧床时间>72h、分娩时BMI≥30kg/m^(2)、血浆FIB水平升高为PE患者产后发生DVT的独立危险因素(P<0.05)。分娩时BMI≥30kg/m^(2)、血浆FIB水平以及二者联合预测PE患者产后发生DVT的ROC曲线下面积分别为0.654、0.744、0.836,二者联合预测价值高于单一指标。结论:PE患者分娩时BMI≥30kg/m^(2)、血浆FIB水平高是产后发生DVT的独立危险因素,二项指标联合预测PE孕妇产后发生DVT有一定临床价值。

UVC联合PICC在极低体重儿中的应用

目的:探究脐静脉置管(UVC)联合外周中心静脉置管(PICC)在极低体重儿中的应用。方法:回顾性分析2021年10月—2022年12月浙江省人民医院毕节医院收治的82例极低体重儿。根据置管方式的不同将其分为对照组和观察组,各41例。对照组给予PICC,观察组给予UVC联合PICC。比较两组体重情况及住院时间,置管前后营养状况、骨代谢指标、并发症及家属满意度。结果:置管后,观察组体重高于对照组,住院时间短于对照组,差异有统计学意义(P<0.05)。置管后,观察组白蛋白、白蛋白水平均高于对照组,差异有统计学意义(P<0.05)。置管后,观察组碱性磷酸酶(ALP)、磷(P)、钙(Ca)均高于对照组,差异有统计学意义(P<0.05)。观察组并发症发生率低于对照组,差异有统计学意义(P<0.05)。观察组家属总满意度高于对照组,差异有统计学意义(P<0.05)。结论:UVC联合PICC能够有效提高极低体重儿体重增长,改善营养状况及骨代谢,降低并发症发生风险,缩短住院时间,进而提高家属满意度。

金平普角钴金多金属矿地质特征及矿床成因浅析

普角钴金多金属矿位于金平县城南西方向,平距约25 km,矿区包括老刘寨矿段和期腊矿段,目前已在老刘寨矿段探获1条钴矿化体,赋存于橄榄岩中,为岩浆熔离型钴矿体;在期腊矿段探获3条含金银铜铅多金属矿化体,矿化体均为受构造裂隙或破碎带控制的含硫化物石英脉型矿体。区域成矿地质条件优越,矿区内展现出较好的找矿潜力。通过对成矿地质背景、矿床地质特征、矿化蚀变特征总结,浅析矿床成因,为找矿思路提供理论支撑。

A Preliminary Study on Fluid Inclusions and Mineralization of Xitieshan Sedimentary-Exhalative (SEDEX) Lead-Zinc Deposit

The Xitieshan lead-zinc deposit is located at the northern margin of the Qaidam Basin, Qinghai Province, China, and had developed a complete marine sedimentary-exhalative system. Our preliminary study of ore-forming fluids shows that fluid inclusions in quartz from altered stockwork rocks that represent the pipe facies have a wide range of temperature and salinity. The intense fluid activities are characteristics of the pipe facies of the exhalative system. Fluid inclusions in carbonates near the unstratified ore bodies hosted in the thick-bedded marble which represents vent-proximal facies are large in size and have moderate to high temperatures. They represent unerupted sub-seafloor fluid activity. Fluids in altered stockwork rocks and carbonates have similar H20-NaCI-CO2 system, both belonging to the sedimentary-exhalative system. The fluids migrate from the pipe facies to the unstratified ore bodies. Boiling of the fluids causes the separation of CO2 vapor and liquid H2O. When the fluids migrate into the unconsolidated thick-bedded marble, the escape of CO2, decreasing temperature and pressure as well as some involvement of seawater into the fluids result in the unmixing of fluids with high and low salinity and deposition of ore-forming materials. The two unmixed fluids were trapped in unconsolidated carbonates and the ore-forming materials were deposited in the unconsolidated carbonates to form the sedimentary-exhalative type unstratified ore bodies. The oreforming temperature of unstratified ore bodies is up to high temperature indicating that there is a huge ore-forming potential in its deep.