一级做a爰片丝袜A片-国产超级特黄Av-一级黄片。。。。。。。。视频-男女三级全黄视频-亚洲一级毛片免费在线观看-一级a免一级a免做免费线看内裤-中国一级黄色视频免费看-亚洲第一久久三级毛片-a免费黄色a片一级

陜西月河金礦 

陜西月河金礦（產(chǎn)于第四紀(jì)的現(xiàn)代砂金礦－階地河漫灘型）

月河砂金礦床是我國于70年代中后期勘探的。當(dāng)時(shí)共圈出9個(gè)礦段，月河流域位于陜西省東南部，早在唐代這里就開始了采金活動(dòng)，以后時(shí)有起伏，古采淘遺跡彼彼皆是。目前，單個(gè)礦體或礦床規(guī)模均居全國砂金礦之冠。

該區(qū)地處秦嶺與巴山之間，為一狹長盆地。南北兩側(cè)為褶皺山地，中部開闊平坦。月河斷陷盆地為一北緩南陡的不對稱箱形谷地。

Shaanxi Gold River
Shaanxi River (modern gold placer gold - terrace floodplain type produced in Quaternary)
River sand deposit is in China in the late 70's in exploration. At that time, a total of circle nine ore section, Yuehe Valley is located in the southeastern part of Shaanxi Province, as early as the Tang Dynasty here began gold mining activities, since there are ups and downs, ancient mining Amoy remains bee is all. At present, the single ore body or the size of the ore deposits in the national sand gold crown.
The area is located between Qinling Mountains and Bashan, is a narrow basin. North and south sides of the fold mountain, open the middle of the flat. The asymmetric box faulted basin is a river valley north steep slope in the South slope.