Bora area have a mineralization system associated with geothermal activity, characterized by the presence of veins in the rock. This study aims to determine the indication of ore mineral. The method that used in this research is geological field survey and mineragraphic analysis. The results showed that the vein texture in the study area was in the form of crustiform-colloform, moss, and zoned crystal textures. Mineragraphic analysis results show the mineral content of ore associated with veins in the rock including pyrite, chalcopyrite and covelite. This proves that indication ore mineral in bora area is associated with the veins formed in the rock.

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Latar Belakang: Nyeri punggung   bawah saat kehamilan mencapai puncak pada minggu ke 24 sampai  dengan  waktu  persalinan.  Nyeri  punggung  sering  di  perparah  dengan terjadinya backache atau sering disebut dengan nyeri punggung yang lama. Backache ini 45 % wanita saat dicatat kehamilannya, mereka meningkat 69% pada minggu ke 28 dan hampir bertahan pada tingkat tersebut. Keluhan nyeri punggung yang dialami oleh ibu hamil tentunya tidak bisa dibiarkan begitu saja Tujuan: untuk mengetahui Pengaruh Senam Hamil Terhadap Penurunan Nyeri Punggung  Bawah  Pada  Ibu  Hamil  Trimester  II dan  III Puskesmas Gebang. Metode: Penelitian ini menggunakan rencana penelitian eksperimental Pengambilan data menggunakan kuesioner. Data diolah dengan analisis univariat menggunakan statistik deskriptif dan analisis bivariat menggunakan uji Chi-square. Hasil: Dari hasil penelitian dapat diketahui bahwa penurunan nyeri punggung bawah sebelum melakasanakan  senam hamil dan setelah dilaksanakan senam hamil yaitu sebanyak 17 responden atau 53,1 % dengan nyeri sebelum senam hamil FPR-S nomor 4 (sangat nyeri) dan setelah dilaksanakan senam hamil dengan nyeri menurut FPR-S nomor 3 (lebih nyeri) sebanyak 13 responden atau 40,7%.. Hasil analisis uji statistik spearman rank dengan bantuan program SPSS pada taraf  kesalahan 5 % dilakukan perhitungan untuk mengetahui  ada  tidaknya  pengaruh  antara  dua  variabel  terikat dengan hasil ada pengaruh penurunan nyeri punggung sebelum melaksanakan senam hamil dan sesudah melaksanakan senam hamil terhadap penurunan nyeri punggung bawah pada ibu hamil trimester II dan III di puskesmas gebang Kabupaten langkat. Kesimpulan: Terdapat pengaruh senam hamil terhadap penurunan nyeri punggung bawah pada ibu hamil trimester II dan III Background: Low back pain during pregnancy reaches its peak at week 24 until delivery. Back pain is often exacerbated by the occurrence of backache or often referred to as long back pain. Backache was 45% of women at the time of pregnancy, they increased 69% at week 28 and almost stayed at that level. Complaints of back pain experienced by pregnant women certainly cannot be left alone. Purpose: to determine the effect of pregnancy exercise on lower back pain reduction in pregnant women in the second and third trimesters at the Gebang Health Center. Methods: This study uses an experimental research plan. Data collection uses a questionnaire. The data were processed by univariate analysis using descriptive statistics and bivariate analysis using the Chi-square test Results: From the results of the study, it can be seen that the decrease in lower back pain before carrying out pregnancy exercises and after carrying out pregnancy exercises is as many as 17 respondents or 53.1% with pain. before pregnancy exercise FPR-S number 4 (very painful) and after carrying out pregnancy exercise with pain according to FPR-S number 3 (more painful) as many as 13 respondents or 40.7% . The results of the statistical analysis of spearman rank with the help of the SPSS program in The error rate of 5% was calculated to determine whether there was an influence between the two dependent variables with the result that there was an effect of decreasing back pain before carrying out pregnancy exercises and after carrying out pregnancy exercises on reducing low back pain in pregnant women in the second and third trimesters at the Gebang Health Center, Langkat. Conclusion: Pregnancy Exercise on Reducing Back Pain Below for pregnant women in the second and third trimester