Reserve estimation of an open pit mine under price uncertainty by real option approach

Reserve estimation is a key to find the correct NPV in a mining project. The most important factor in reserve estimation is the metal price. Metal price fluctuations in recent years were exaggerated, and imposed a high degree of uncertainty to the re-serve estimation, and in consequence to the whole mine planning procedure. Real option approach is an efficient method of deci-sion making in the uncertain conditions. This approach has been used for evaluation of defined natural resources projects until now. This study considering the metal price uncertainty used real option approach to prepare a methodology for reserve estimation in open pit mines. This study was done on a copper cylindrical deposit, but the achieved methodology can be adjusted for all kinds of deposits. This methodology was comprehensively described through the examples in such a manner that can be used by the mine planners.     

江西浒坑钨矿含矿韧性剪切带及其^40Ar-^39Ar年代学约束

江西省浒坑钨矿是一个大型石英脉黑钨矿矿床,含矿石英脉除了块状石英脉以外,还大量发育条带状石英脉。本文针对条带状石英脉进行了专门研究,认为条带状石英脉实质上是韧性剪切带,以透入性发育的剪切面理和拉伸线理、剪切透镜体、剪切分异条带普遍发育为特色。剪切带岩石以石英质糜棱岩为主,具有丰富的塑性变形显微构造特征。显微剪切指向构造统计表明,东西向和北西向脉组的运动方式均以左旋正滑为主,近水平脉组则以正滑为主。北西向韧性剪切带的新生绢云母^40Ar-^39Ar坪年龄为140．3±1．0Ma,相应的等时线年龄为139．6±2．4Ma;而东西向韧性剪切带绢云母^40Ar-^39Ar坪年龄则比较复杂,高温阶段年龄可能受到成矿期白云母残斑的影响,中温阶段的表观年龄和总气体年龄更接近前一样品的坪年龄。据此认为韧性剪切变形的年龄为140Ma左右,韧性变形发生在成岩和成矿之后。条带状石英脉系块状石英脉韧性剪切改造而成,推测其形成主要与晚期补充岩体的斜向上侵作用有关,但更为合理的模式需要更多资料的进一步证实。     

广西老堡铅锌矿褶皱形成机制及其控矿规律

老堡铅锌矿床主要赋存在陡山沱组白云岩或老堡组硅质岩中,顺层产出,受地层与褶皱的双重控制。矿区主干褶皱为一复式向斜,由2个次级向斜和1个次级背斜组成。从构造几何学、运动学角度,运用现代测试技术,对矿区的小构造、显微构造和组构进行构造分析后揭示,老堡褶皱构造的形成机制是以弯滑作用为主、兼具弯流作用的纵弯褶皱作用的产物。铅锌矿体主要赋存在褶皱的转折端虚脱部位及两翼滑移量较大的层间滑动破碎带中。     

HPV16型免疫胶体金诊断试纸条的制备

建立一种快速、准确、简便检测高危型人乳头瘤病毒16型的胶体金诊断试纸条,以用于宫颈癌的早期筛查。用柠檬酸三钠还原法制备了酒红色的30 nm胶体金颗粒,胶体金颗粒标记的单抗的实际标记量为6μg/mL。选用了2种稳定剂BSA和PEG20000获得了稳定的金标抗体溶液。实验结果表明:第7种样品垫处理液和第7种结合垫处理液处理样品垫和结合垫组装的试纸条效果最好;试纸条检测HPV16E6蛋白为阳性,检测HPV16L1蛋白为阴性。     

对苯二酚在金、银纳米粒子修饰的玻碳电极上电化学响应的比较

制备了柠檬酸钠保护的金和银纳米粒子,并用自组装法制备了金和银纳米粒子修饰的玻碳电极,在近中性的磷酸缓冲溶液中,比较研究对苯二酚在金和银纳米粒子修饰玻碳电极上的电化学响应情况。结果表明金和银纳米粒子均对对苯二酚的电氧化过程具有优越的电催化效果;与银纳米粒子修饰电极相比,金纳米粒子修饰电极表现出了良好的稳定性;对苯二酚在金纳米粒子修饰玻碳电极上的电化学反应是受扩散控制的。     

Preparation of Gold Nanorods of High Quality and High Aspect Ratio

We report the synthesis of gold nanorods (NRs) by seed-mediated growth method. A small amount of different shapes such as triangles, hexagons and a large amount of rods are obtained by varying the proportion of seed to metal salt, adding NaOH to growth solution as well as using the seed solution of CTAB-capped agent. The gold nanorod (NR) formation yield is improved. Meanwhile, the growth mechanism of high yield gold NRs is discussed. The high quality single size NRs can be separated from polydisperse sampl...     

大孔强酸树脂吸附硫脲金

研究了D072大孔强酸性阳离子交换树脂从硫脲[Tu=CS(NH2)2]浸金液中吸附Au(Tu)2+的性能和机理. 结果表明，pH=2.0时，树脂对Au(Tu)2+有优良的吸附性能，金的交换容量为78.95 mg/g (Au/干树脂)，吸附的硫脲金可用乙醇-硫酸水溶液洗脱，洗脱率可达96.5%. D072树脂对Au(Tu)2+的吸附符合Langmuir吸附模型.     

气固错流移动颗粒床过滤器压降特性研究

研究了错流移动颗粒床过滤器操作压降与过滤介质特性、表现过滤气速、颗粒层移动速度和床层粉尘沉积量之间的关系。结果表明，无粉尘沉积时，床层压降可以用Ergun方程计算。颗粒层移动速度的变化并不会造成床层压降的显著变化。除尘过程中，床层内粉尘沉积量随气体中粉尘浓度的增大、颗粒层移动速度的减小而增加，同时将导致床层压降的显著增大。错流移动床除尘操作压降可以用带修正项的Ergun方程计算，其修正项为比沉积率和颗粒层空欧率的函数。在实验数据范围内，该方程的计算结果与实验数据最大偏差小于15％。     

Aromatization of n-hexane on Mo2C catalysts

The deposition-precipitation method was used to prepare gold catalysts based on different supports. Their catalytic activities for combustion of carbon monoxide (CO) and formaldehyde (HCHO) were investigated. All these catalysts showed good activity for the two reactions and the Au/CeO₂-a catalyst exhibited the highest activity for the two reactions. Furthermore, catalysts derived from the as-precipitate hydroxides exhibited higher activity than that from corresponding oxide supports. The BET, XRD, TEM and XPS were carried out. The results indicated that the gold dispersed more homogeneous on the as-precipitate hydroxide supports than that on the corresponding oxide supports.     

人血清淀粉样蛋白A1原核表达及胶体金检测方法的建立

通过胶体金免疫层析技术建立一种特异、便捷、快速的SAA1定量检测新方法.利用大肠杆菌BL21(DE3)原核表达人血清淀粉样蛋白A1(SAA1),根据BL21(DE3)表达偏好性设计并合成SAA1蛋白基因片段,构建表达载体pET-28a-SAA1,采用CaCl2法制备BL21(DE3)感受态,热激转化法将pET-28a-SAA1转入到BL21(DE3).经表达条件优化,获得重组蛋白最佳诱导表达条件:温度30℃,时间6h,转速180rpm/min,培养基pH 7.0,IPTG浓度0.4mM,诱导表达后目的蛋白经SDS-PAGE电泳鉴定,Ni柱纯化、透析、浓缩从而获得浓度为8.09mg/ml,纯度为85%的SAA1.同时,结合胶体金标记技术,建立了SAA1胶体金免疫层析试纸检测方法,线性范围0.16~500μg/ml,最低检测限0.16μg/ml,该研究为临床体外诊断SAA1快速检测提供技术基础.