Geothermal Resource at the McGee Mountain Prospect, Humboldt County, Nevada

This report describes the geothermal resource at McGee Mountain, including:
1. Local geology
2. Thermal features
3. Known boreholes and temperature gradients
4. Geophysical surveys
5. Fluid geochemistry and geothermometry
6. Estimate of the heat-in-place

Description of the heat-in-place estimate:
The magnitude of the geothermal resource at McGee Mountain (Painted Hills) has been estimated using a Monte Carlo method applied to estimating heat-in-place. The method relies (along with certain other parameters) on estimates of the area, thickness and average temperature of the resource, but among these, only area has some constraint at this time. Therefore, the estimates used for thickness and temperature have been based on the characteristics of other
geothermal resources in Nevada.

Results yield a 90%-probable ("P90") thermal energy-in-place estimate of 87,300 MWth-years (that is, 90% of estimates are higher). We consider this to be a minimum likely value. At 50% probability ("P50") the estimate is 134,000 MWth-years. The recoverable portion of the preceding estimate of energy-in-place has also been estimated and converted into electrical energy, using values of recovery factor, rejection temperature, utilization factor, plant capacity factor and power plant life that are provided. The minimum (90% probable) estimate for generation potential is about 25 MWe for 30 years (or a total of 750 MWe-years) and at 50% probability the estimate is 52 MWe for 30 years (or a total of 1,560 MWe-years). These estimates are somewhat larger than a public-domain McGee resource estimate made by GeothermEx in 2004, because a 2-m deep temperature survey by Caldera has established continuance of the thermal anomaly about a half mile further north than previously documented.

This resource estimate was made without reference to the Caldera property (project area) boundary, but it is likely that the entire magnitude of estimated resource lies within it. The estimate should be regarded with caution because there needs to be subsequent proof of area, thickness, temperature and commercial permeability by means of deep drilling and testing. No heat-in-place estimate of this type should ever be used to determine the final, installed size of a well field and power plant.

本报告详述了麦吉山脉的地热资源，具体包括以下内容：
1. 当地地质特征
2. 热力特征
3. 已知的钻孔及温度梯度
4. 地球物理调查
5. 流体地球化学与地温学
6. 地热资源蕴藏热量的估算。

关于地热资源蕴藏热量估算的描述：
麦吉山脉（彩绘山）地热资源的规模估算采用蒙特卡洛方法，应用于地热资源蕴藏热量的估算。此方法依赖于（连同其他某些参数）对资源面积、厚度和平均温度的估算，但在此之中，唯有面积有所约束。因此，厚度和温度的估算基于内华达州其他地热资源的特性。

估算结果提供了一个90%概率（P90）的地热资源蕴藏热能量估算值，为87,300兆瓦时（即90%的估算值均高于此数值）。我们认为这是一个最可能的最低值。在50%概率（P50）的情况下，估算值为134,000兆瓦时。上述地热资源蕴藏能量估算的可回收部分亦已估算，并转换为电能，使用提供的回收率、排放温度、利用率、电厂容量系数和电厂寿命等值进行转换。最低（90%概率）的发电潜力估算约为30年内25兆瓦电（总计750兆瓦时），在50%概率下，估算值为30年内52兆瓦电（总计1,560兆瓦时）。这些估算值略高于2004年由GeothermEx（一家公共领域机构）进行的麦吉资源估算，因为Caldera（一个地热项目）进行的2米深温度调查证实了热异常的连续性，比之前记录的向北延伸约半英里。

此资源估算未考虑Caldera财产（项目区域）边界，但估计估算的资源总量可能全部位于其内。此估算应谨慎对待，因为需要通过深钻和测试进一步证明面积、厚度、温度和商业渗透性。此类蕴藏热量的估算绝不应用于确定井场和电厂的最终安装规模。