MIDEAST STOCKS-Saudi weighed down by weak Q3 earnings

DUBAI, Oct 18 (Reuters) - Several disappointing third-quarter results from large Saudi companies dragged on the kingdom's stock index in morning trade on Tuesday, while other Gulf markets edged up in modest trade. Riyadh's index was down 0.8 percent after 70 minutes. Saudi Arabian Mining Co (Ma'aden) fell 2.7 percent after it posted a 4.6 percent rise in third-quarter net profit to 83.6 million riyals ($22.3 million) but missed analysts' average forecast of 122.7 million riyals. National Industr