NEW YORK (TheStreet) -- Gold-mining stocks such as Barrick Gold (ABX) , Yamana Gold (AUY) - Get Report, Goldcorp (GG) and Newmont Mining (NEM) - Get Report belong as holdings in diversified investment portfolios, especially during a time of weak economic growth.

The value of gold stocks became more apparent this week, as we learned that first-quarter gross-domestic-product growth was revised downward to an anemic 0.2%, and Barrick and Newmont shares traded at 2015 highs. As outlined here twice before this year -- once in January and once in February, gold-related stocks can serve as a hedge against stock-market and economic risks.

Today we will look at the daily charts and provide updated key technical levels for four gold-mining stocks. Keep in mind that Comex gold ended Wednesday, up 1.6% year to date.

Investors not familiar with technical analysis should begin with the notion that a price chart for a stock shows a road map of past price performance, which provides guidance for predicting future share-price direction.

Here's how to read a daily chart. There are two moving averages to follow; the 50-day simple moving average is in blue, while the 200-day simple moving average is in green.

Here's the daily chart for Barrick Gold.


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Barrick Gold closed $13.51 on Wednesday, up 26% year to date and 33% above its 2015 low of $10.15, which was set on Jan. 14. The stock has been above its 50-day simple moving average of $12.03 since April 6, and Wednesday's high of $13.70 was a test of the 200-day simple moving average of $13.68, a level at which investors should consider reducing positions.

Investors looking to reduce holdings should place a good-till-canceled limit order to sell the stock if it rises to $14.88, which is a key level on technical charts until the end of June.

Here's the daily chart for Yamana Gold.


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Yamana Gold closed at $4 on Wednesday, down just 0.5% year to date and 20% above its 2015 low of $3.33 set on March 11. The stock is above its 50-day simple moving average of $3.89 and well below its 200-day simple moving average of $5.25.

Investors looking to buy Yamana should place a good-till-canceled limit order to purchase the stock if it drops to $3.40, which is a key level on technical charts until the end of this week.

Investors looking to reduce holdings should place a good-till-canceled limit order to sell the stock if it rises to $7.58, which is a key level on technical charts until the end of 2015.

Here's the daily chart for Goldcorp.


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Goldcorp closed at $20.16 on Wednesday, up 8.9% year to date and 13% above its 2015 low of $17.91 set on March 11. The stock is above its 50-day simple moving average of $19.64 and below its 200-day simple moving average of $22.33.

Investors looking to buy Goldcorp should place a good-till-canceled limit order to purchase the stock if it drops to $14.89, which is a key level on technical charts until the end of April.

Investors looking to reduce holdings should place a good-till-canceled limit order to sell the stock if it rises to $36.10, which is a key level on technical charts until the end of 2015.

Here's the daily chart for Newmont Mining.


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Newmont Mining closed at $26.48 on Wednesday, up 40% year to date and 42% above its 2015 low of $18.60 set on Jan. 2. The stock has been above its 50-day and 200-day simple moving averages of $23.61 and $22.94 since April 24.

Investors looking to buy Newmont should place a good-till-canceled limit order to purchase the stock if it drops to $19.78, which is a key level on technical charts until the end of April.

Investors looking to reduce holdings should place a good-till-canceled limit order to sell the stock if it rises to $36.08, which is a key level on technical charts until the end of 2015.

This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.